A curated list of 13 high‑quality Spring Boot open‑source projects—including e‑commerce platforms, microservice frameworks, payment systems, and ERP solutions—each with brief descriptions, key features, and demo links to help Java developers find valuable codebases for learning and real‑world use.
This article introduces a curated selection of Alibaba’s open‑source and cloud‑based developer tools—including Arthas, Cloud Toolkit, ChaosBlade, ARMS, Docsite, Freeline, EasyExcel, Druid, Dragonwell and more—detailing their use cases, tutorials, and acquisition methods to help developers improve efficiency and code quality.
Discover the eleven most popular GitHub repositories of April, ranging from the 996.ICU protest project and university course collections to algorithm libraries, design tools, and essential Java and Python guides, each highlighted with stars, links, and brief descriptions.
This article introduces the concepts of block, file, and object storage and reviews several open‑source distributed object storage solutions—including Swift, Ceph, MinIO, HBase MOB, and Hadoop Ozone—highlighting their architectures, features, and typical use cases for large‑scale data handling.
This article introduces Linux‑command, a comprehensive, searchable reference covering over 540 Linux commands with syntax, options, and examples, helping developers quickly recall and master command‑line tools while highlighting its popularity, features, and visual interface.
SQLFlow, an open‑source project from Ant Financial, bridges SQL engines and AI frameworks so that users can train and predict machine‑learning models with simple SQL statements, dramatically lowering the technical barrier for analysts and engineers across diverse data platforms.
SQLFlow is an open‑source project that connects diverse SQL engines (MySQL, Hive, SparkSQL, etc.) with AI frameworks (TensorFlow, PyTorch, XGBoost, etc.) through extended SQL syntax, enabling analysts to train and predict models using only a few SQL statements while aiming for high scalability and performance.
After 18 months of negotiations, Oracle refused to sign a trademark transfer agreement with the Eclipse Foundation, jeopardizing the vendor‑neutral status of Eclipse IDE and Jakarta EE and potentially ending Java EE as a viable platform for developers.
This article presents a curated list of fourteen of the most renowned programmers worldwide, detailing their reputation, major achievements, and community quotes, offering readers insight into the individuals who have shaped modern software development and computer science.
This article presents a curated list of fifteen Alibaba open‑source and cloud‑based developer tools—including Java diagnostics, IDE plugins, chaos engineering, monitoring, static site generators, mobile compilation, and database utilities—detailing their usage scenarios, tutorials, and acquisition methods to boost development efficiency.
In a candid 25‑year follow‑up interview, Linus Torvalds and Robert Young discuss Linux’s evolution, development philosophy, future outlook, hardware choices, open‑source culture, and advice for young developers, while also tracing Young’s entrepreneurial journey from early ventures to his current projects.
This roundup covers GoDaddy's open‑source Kubernetes External Secrets project, free CNCF cloud‑native courses for Chinese developers, major Kubernetes performance and security enhancements, Knative and Istio updates, containerd improvements, a shift from rich‑container ops to cloud‑native practices, and recommended open‑source and reading resources.
After a quarter‑century since his first interview, Linus Torvalds and Robert Young discuss Linux’s evolution, development philosophy, hardware choices, the future of the kernel, open‑source culture, and advice for young programmers, offering candid insights into the project's past, present, and outlook.
Tencent Cloud researcher Du Junping’s elevation to Apache Software Foundation Member highlights his decade‑long progression from Hadoop contributor to voting board member, while illustrating Apache’s transparent governance hierarchy and Tencent’s Open‑Source Alliance efforts to streamline reviews, mentor projects, and rigorously assess open‑source health.
The article introduces Ctrip’s internally used React Native framework CRN, explains its background, performance‑focused architectural simplifications, open‑source contents such as CLI and Runtime, applicable scenarios for pure and hybrid apps, and provides step‑by‑step instructions for integrating CRN into existing or new mobile projects.
The article explains how Google’s refusal to grant DRM licensing to the open‑source Electron‑based Metastream browser highlights the challenges faced by small browsers in obtaining Widevine support, forcing developers to consider abandoning desktop versions or becoming limited extensions.
The DTLE 2.19.03.0 release introduces cross‑data‑center transfer, cloud synchronization, data aggregation, DDL filtering, schema name conversion, and numerous bug fixes, providing a reliable MySQL‑focused middleware for diverse data replication and migration scenarios.
This article provides a comprehensive overview of operating systems, covering their definition, core components, historical evolution, classifications, key functions, the GNU/Linux ecosystem, licensing models, versioning schemes, major distributions, package managers, and the role of Linux in modern computing environments.
The article explains the renaming of the open‑source distributed transaction framework Fescar to Seata, outlines the background and evolution of distributed transactions at Alibaba and Ant Financial, and shares recent community milestones and future plans for the project.
After years of legal battles over VMware's use of GPL‑licensed Linux code in its ESXi hypervisor, developer Christopher Helwig has abandoned his appeal, citing the court's high evidentiary demands and VMware's recent pledge to stop using Linux code.
This article presents a curated collection of prominent Java open‑source projects—including learning guides, development tools, e‑commerce platforms, big‑data frameworks, distributed transaction solutions, and security resources—each accompanied by brief descriptions and GitHub links for developers seeking valuable Java ecosystem resources.
Matrix for iOS/macOS is an open‑source performance probing tool from the WeChat team that monitors crashes, jank, and memory issues on iOS and macOS, offering plugins for detailed stack capture and out‑of‑memory reporting, with future plans for power‑consumption tracking and cloud integration.
An in‑depth data analysis of the 996.ICU GitHub repository shows where the protesting programmers work, which cities they live in, their typical GitHub activity, the most discussed issues, and the common keywords in their bios, highlighting the scale of the anti‑996 movement.
ChaosBlade is an open‑source chaos engineering tool from Alibaba that lets you repeatedly inject failures into distributed systems, helping you measure fault tolerance, validate orchestration, test platform robustness, verify monitoring alerts, and improve emergency response capabilities for more reliable cloud‑native applications.
This article presents Mybridge's curated list of ten highly starred Python open‑source projects, ranging from web‑scraping tools and testing frameworks to code formatters and data‑analysis utilities, each with a brief description and direct GitHub link.
Mica is a Java‑8 based microservice framework that evolved from lutool, offering servlet and reactive WebFlux support, auto‑configuration via Spring Boot and Spring Cloud without third‑party dependencies, modular components, LGPL‑v3 licensing, and detailed update notes for developers.
This article compiles a curated list of the ten most popular free open‑source admin dashboard UI frameworks, detailing their GitHub star counts, repository links, core technologies, and visual screenshots to help developers quickly choose a suitable backend control panel solution.
Linus Torvalds, born in Helsinki in 1969, created the Linux kernel in 1991 after experimenting with MINIX and writing his own disk driver, championing free software principles that now power billions of devices—from servers to Android phones—while his controversial personality sparked intense community debates.
The article examines whether Oracle will be completely supplanted by MySQL, comparing industry adoption, DBA role differences, performance versus scalability, cost considerations, and cultural factors that influence database choices in traditional and internet sectors.
The announcement showcases a 30‑day community sharing event for the open‑source DBLE middleware, highlighting three member submissions that cover a cross‑shard query case study, detailed rule.xml and server.xml configuration guides, and a tutorial on creating custom sharding algorithms, along with reward details.
This article recounts the author’s year‑long experience transforming Sharding‑JDBC into the ShardingSphere ecosystem, detailing technical challenges, community building, Apache Incubator admission, and the project’s evolution into a financial‑grade distributed database solution.
An extensive curated list of 26 Alibaba open‑source projects—including Spring Cloud Alibaba, Druid, fastjson, Dubbo, JStorm, Nacos, Sentinel, and many others—covers essential tools for backend development, data processing, cloud‑native services, monitoring, and more, each with brief descriptions and GitHub links.
This article presents a curated list of the most popular Java open‑source projects on GitHub for January, summarizing each repository’s purpose, key features, and star count to help developers discover valuable resources for learning, building, and advancing Java applications.
The article chronicles Ant Financial’s strategic decision to open‑source the core components of its SOFA middleware—distributed transaction framework and service registry—detailing the technical evolution from early internal frameworks to modern service‑mesh‑enabled cloud‑native architecture and highlighting the business motivations, community impact, and future roadmap.
In 2018 Didi expanded its open‑source portfolio to 12 projects, amassed over 16,000 stars and 2,000 forks, contributed more than 300 pull requests, engaged 65 contributors, and delivered dozens of patches to major projects such as Hadoop, Spark, Flink, and Linux, while deepening community partnerships and outlining ambitious open‑source goals for 2019.
This article presents a curated collection of Alibaba’s open‑source Java projects, ranging from distributed service frameworks like Spring Cloud Alibaba and Dubbo, database tools such as Druid and TDDL, to monitoring, messaging, and cloud‑native components, each with brief descriptions and GitHub links.
The 2019 MySQL Technical Exchange Conference in Shenzhen, co‑hosted by Shanghai Aikesheng and Oracle, featured six expert talks covering secure MySQL platform design, large‑scale architecture optimization, backup and recovery strategies, open‑source middleware, automated operations, and InnoDB row‑lock mechanics, followed by community Q&A and a look ahead to open‑source initiatives.
Apache Dubbo’s latest 2.7.0 release introduces full async programming, separates registry, config, and metadata centers, adds native support for ZooKeeper, Nacos and Apollo, expands multi‑language clients, and outlines the roadmap toward Dubbo 3.0 and graduation from the Apache incubator, reflecting a thriving community revival.
Alibaba Cloud’s president explains why cloud should be a CEO’s top concern, shares IDC market‑share data confirming its dominance in China, introduces the open‑source distributed‑transaction solution Fescar, and highlights several Alibaba‑driven open‑source projects shaping the cloud ecosystem.
This article lists and briefly describes the eleven most popular Java‑related GitHub repositories in December, covering learning guides, e‑commerce platforms, advanced Java topics, performance monitoring, high‑concurrency demos, diagnostic tools, Spring Boot, tutorials, messaging middleware, community software, and the Dubbo RPC framework.
Google's 2018 AI review highlights major advances across ethical AI principles, social‑impact projects, assistive technologies, quantum computing, natural‑language models like BERT, perception research, algorithms, TPU hardware, open‑source releases, robotics, healthcare applications, and plans for an even broader impact in 2019.
Didi Mobility has open‑sourced DDMQ, an enterprise‑grade distributed message queue that delivers millisecond‑level latency and millions of messages per second, supports real‑time, delayed and transactional messages via RocketMQ/Kafka and RocksDB, offers multi‑language SDKs, flexible consumption, server‑side filtering, a unified console, and achieves five‑nine availability across Didi’s ride‑hailing, finance and delivery platforms.
MongoDB changed its open‑source license to the SSPL to curb cloud providers, prompting AWS to launch its own compatible DocumentDB fork, while industry leaders debate the move’s impact on open‑source freedom, developer choice, and MongoDB’s market performance.
This tribute honors the late Linux kernel developer Li Shaohua, highlighting his pivotal contributions to MD RAID, block I/O, NVMe, and storage performance, while sharing personal anecdotes and technical lessons that continue to inspire kernel engineers worldwide.
This week’s Alibaba tech roundup highlights the DAMO Academy’s 2019 top‑10 technology trends—from smart cities and AI chips to blockchain and 5G—plus breakthrough AI liver‑tumor segmentation results, the open‑source Fusion design system, a Flink Forward China recap, a new computer‑vision paper collection, and an upcoming Apache Dubbo live session.
The 2018 Flink Forward China conference in Beijing showcased Apache Flink’s evolution, Alibaba’s massive contributions—including the Blink fork, real‑time BI, online learning and city‑level analytics—and highlighted how industry leaders like Alibaba, Didi and others leverage Flink for scalable, low‑latency big‑data processing across diverse use cases.
The article presents DTLE, an open‑source MySQL data‑transfer middleware that extends replication capabilities with high‑performance CDC, multi‑topology support, cloud‑to‑cloud synchronization, and robust cluster management, while comparing it with other open‑source solutions and showcasing real‑world demos.
Quicksql is an open‑source unified SQL query engine that simplifies and secures cross‑data‑source queries by providing a consistent ANSI‑based language, automatic engine selection, and support for mixed queries across Hive, MySQL, Elasticsearch, and other platforms, reducing learning and integration costs.
Wave Computing announced that the MIPS instruction set architecture and its latest R6 core will be released as open source in early 2019, sparking industry debate about the move’s impact on MIPS’s market position, licensing revenue, and competition with RISC‑V, especially in the AI and Chinese markets.
Matrix is Tencent’s open‑source Android APM that unifies performance monitoring, offering tools like APK Checker, SQLite Lint, Trace Canary, Resource Canary, and IO Canary to detect issues such as leaks, slow methods, and I/O problems, helping developers build higher‑quality apps.
This newsletter introduces Alibaba’s X‑DeepLearning deep‑learning framework, releases a large‑scale cluster dataset for research, announces the upcoming open‑source of the Blink streaming engine, showcases the futuristic FlyZoo Hotel, and shares a welcome letter to new hires, highlighting cutting‑edge technologies across AI, big data, and cloud operations.
Navi is an open‑source component‑routing framework that separates routing logic from business code using matcher annotations, allowing developers to define reusable handlers for different client types and versions, thereby reducing code complexity, improving extensibility, and simplifying backend services while supporting future extensions and community contributions.
The article argues that, despite common advocacy for open‑source, closed‑source solutions can sometimes be preferable because they relieve users from bug‑fixing, licensing complexities, overwhelming choices, and the need to hunt for documentation or support, relying instead on vendor assistance.
This article chronicles Dubbo’s journey from its 2018 Apache incubation vote through its key features, release history, and upcoming 2.7 version that aims to graduate the high‑performance Java RPC framework to an Apache top‑level project.
This article traces the evolution of Alibaba’s internal microservice configuration center—from a group‑wide tool to a commercial cloud product and finally an open‑source project—detailing design decisions such as centralized control, dynamic push, namespace isolation, release governance, capacity limits, and console UX improvements.
This article compiles over sixty top open‑source tools spanning version control, build automation, continuous integration, deployment, configuration management, container platforms, monitoring and logging, providing a comprehensive resource for building efficient DevOps pipelines.
This article compiles over fifty open‑source and free Kubernetes tools, organized into categories such as cluster deployment, monitoring, testing, security, CLI utilities, development aids, CI/CD pipelines, serverless frameworks, service discovery, and native visualization, providing concise descriptions, repository links, and cost information for each.
This article traces OpenStack’s rise, decline, and recent resurgence, describing how the foundation refocused on core services, launched pilot projects in CI/CD, containers, edge computing, and AI, and positioned the platform as a mature, widely‑adopted private‑cloud solution.
The article explains the formation of the Ceph Foundation, outlines Ceph’s widespread adoption, and provides a detailed, step‑by‑step analysis of the Scrub and Deep‑Scrub processes, highlighting their operation, limitations, and ongoing efforts to improve automatic repair.
In this interview, Kubernetes contributor Lei (Harry) Zhang explains the CRI Shimv2 interface, its benefits for developers and end‑users, reflects on the 2018 container ecosystem evolution, shares highlights from KubeCon Shanghai, and discusses balancing open‑source engineering with technical evangelism.
This guide lists and briefly describes 18 open‑source and cloud‑based machine learning platforms—from H2O and TensorFlow to Azure ML and AWS services—highlighting their key features, supported languages, and typical use cases for developers at any skill level.
The article surveys ten leading open-source AI tools and frameworks—including TensorFlow, SystemML, Caffe, Apache Mahout, OpenNN, Torch, Neuroph, Deeplearning4j, Mycroft, and OpenCog—detailing their primary features, supported languages, hardware compatibility, and typical use cases for research and development.
The article announces the open-source release of the Windows Agent component under the Apache license, its integration into the Open-Falcon community, future feature enhancements, and gratitude to contributors, while providing links to the source code and related documentation.
This article provides a comprehensive overview of Platform as a Service (PaaS), covering its definition, service model distinctions, historical milestones, major vendors, technical characteristics, container foundations, and the most prominent open‑source and commercial PaaS platforms.
This article chronicles the eight‑month development of ShardingSphere 3.0.0, detailing its origins from Sharding‑JDBC, the addition of Sharding‑Proxy and Sidecar, core feature enhancements, distributed transaction redesign, community growth, and future roadmap for the open‑source database middleware ecosystem.
This article chronicles Red Hat’s journey from its Unix roots in the 1960s through key milestones like the GNU project, Linux adoption, major product launches, strategic acquisitions, and its eventual $34 billion acquisition by IBM, highlighting its impact on open‑source and cloud computing.
This essay explores how differing philosophies between closed‑source and open‑source software drive distinct business models, legal risks, and innovation pathways, highlighting open source's growing influence across AI, blockchain, DevOps, licensing, and cloud computing.
The 2018 China Open‑Source Annual Report analyzes GitHub data, introduces the Grank health index, highlights dominant companies and trending technologies such as AI, cloud, and blockchain, and reveals how activity and community decentralisation shape the vitality of Chinese open‑source projects.
The article traces the origins of the Zend Engine, its role as PHP’s core, the corporate shifts after its acquisition by Rogue Wave, and the recent departure of its key developers, highlighting community concerns and hopes for future contributions to PHP 8.
GitHub’s 2018 Octoverse report uncovers global developer habits, highlighting the most chatty nations, favorite emojis, peak activity hours, top programming languages, fastest‑growing topics like AI, and major platform updates such as GitHub Actions and Connect, offering a comprehensive snapshot of the open‑source ecosystem.
This article explains the rapid rise of open‑source technologies, outlines common questions and risks associated with open‑source license usage, summarizes a guide covering eleven major licenses, and announces the OSCAR Open Source Pioneer Day where experts will discuss compliance and best practices.
The article chronicles Elastic’s journey from a small open‑source search tool to a NYSE‑listed company, explaining Elasticsearch’s technical foundations, its real‑world applications, and what the IPO means for developers and the broader search‑technology ecosystem.
Logan, Meituan‑Dianping’s open‑source mobile logging framework, unifies log collection, secure storage, backend processing, and visual frontend tools to capture all user‑side logs without sampling, enabling fast case‑analysis debugging across Android, iOS, mini‑programs and web, with future ML‑driven insights.
The article reviews three high‑star Java interview projects on GitHub—interviews, Java‑Interview, and JavaGuide—detailing their coverage of coding practice, data structures, algorithms, and system design, along with star/fork statistics and direct repository links to help developers prepare for technical interviews.
Elastic's NYSE debut, its rapid stock surge, the origins and technical strengths of Elasticsearch, and what the company's public listing means for developers and tech entrepreneurs are explored in detail, highlighting the journey from a personal recipe‑search tool to a global data‑search platform.
Over the past two years AMP has grown from a tiny project to a large open‑source effort with over 700 contributors, prompting a shift from a single‑maintainer governance model to a consensus‑based Technical Steering Committee and working groups to give all community members a voice.
JD Security presents a series of AI‑driven security innovations—including black‑box explanation methods, deep‑learning crash analysis, AI‑vs‑AI e‑commerce fraud defenses, and open‑source collaboration—to illustrate how artificial intelligence can be made transparent, effective, and safely integrated into modern security operations.
The Redis community is urging a rename of the master‑slave replication terminology due to social concerns, but the project's lead highlights significant compatibility costs, outlining short‑term compromises and long‑term redesigns while balancing technical feasibility and community expectations.
This article compares MySQL and PostgreSQL across open‑source licensing, ACID compliance, SQL standard support, replication modes, concurrency control, performance characteristics, high‑availability solutions, external data source integration, and storage models, helping readers decide which database best fits their workloads.
This guide explains why contributing to open‑source projects matters, outlines the benefits, walks through essential Git operations, forking, pull‑request workflow, CI checks, mailing‑list communication, and best practices, helping newcomers become effective contributors to projects like incubator‑dubbo.
This article presents a curated collection of outstanding Spring Cloud open‑source projects, describing their purpose, key features, and providing direct GitHub links to help developers quickly adopt microservice solutions and related tools in Java‑based cloud‑native environments.
On August 4 2018, Didi Open Source and the Open Source Database Forum hosted a salon where five industry experts presented the latest advances in open‑source databases—covering Redis multi‑data‑center deployment, MySQL InnoDB Cluster, streaming‑processing architecture, PostGIS GIS solutions, and Redis 5.0 features—followed by a Q&A, a prize draw, and a showcase of Didi’s growing open‑source portfolio.
GitHub created the open‑source GitHub Load Balancer (GLB), a bare‑metal load‑balancing solution that uses Rendezvous hashing to smoothly add or remove nodes, offering high availability, DDoS resilience, and scalable performance for massive connection workloads, and is now publicly available on GitHub.
GitHub’s GLB Director is an open‑source, layer‑4 load balancer designed for data‑center environments that scales a single IP across thousands of servers, uses ECMP, a stateless director layer, DPDK‑accelerated packet processing, and health‑check mechanisms to provide high‑availability without disrupting existing connections.
China’s 2018 Cloud Computing Development White Paper reveals that the public cloud market grew over 50% in 2017, predicts continued rapid expansion, highlights fierce competition among industry clouds, the rise of hybrid and multi‑cloud strategies, growing security concerns, open‑source adoption, and evolving policy and technology trends.
This 1991 article by Linus Torvalds explains what Linux is, its free Unix‑like kernel, licensing terms, required 386‑AT hardware, how to obtain the source via FTP, step‑by‑step installation, missing features, ported utilities, and ways to get technical help.
Andromeda is an open‑source Android framework that unifies local and cross‑process component communication by providing blocking IPC, a global event bus, remote callbacks, and a dispatcher‑based architecture, solving the limitations of existing single‑process routing solutions.
The article presents a technical overview of Chatopera’s multi‑turn dialogue platform, covering language model fundamentals, Chinese segmentation, word embeddings, information retrieval, and open‑source tools, while illustrating how these AI techniques enable low‑cost, scalable enterprise chatbot solutions.
This article recounts Linus Torvalds' 1991 announcement of Linux—a free Unix‑like kernel for 386‑AT machines—detailing its design, permissive licensing, required hardware, how to obtain the source, step‑by‑step installation, known limitations, and early ported GNU tools.
From its AT&T Bell Labs origins to modern cloud servers, this article traces Unix’s evolution, explains how Linux emerged from the GNU project, and compares the two systems’ philosophies, licensing, and practical differences for developers and enterprises today.
This guide reviews eight free Linux antivirus tools—ClamAV, ClamTk, ChkrootKit, Rootkit Hunter, Comodo, Sophos, BitDefender, and F‑PROT—detailing their key capabilities, platform support, and how they help protect servers and workstations from malware and rootkits.
The June 2018 Ceph Developer Monthly Report reviews key changes such as the deprecation of ceph‑disk, the upcoming seastar‑based OSD, SMART‑driven disk‑failure prediction, new rbd namespace support, BlueStore memory optimizations, iWARP RDMA support, and several operational enhancements.
The article argues that programmers who spend most of their careers developing on Linux tend to advance faster than those confined to Windows, citing differences in open‑source availability, API complexity, learning curves, and the ability to study superior architecture and design patterns.
Based on interviews with over ten recent interviewees and personal experience, the article argues that developers using Linux or macOS tend to have higher development proficiency than those on Windows, due to open-source access, superior command‑line tools, and more consistent package management.
This article introduces Yugong, an open‑source ETL framework for heterogeneous database migration, explains its core Extractor‑Translator‑Applier architecture, details key classes and interfaces, discusses limitations of the original version, and describes extensive refactoring and new features added to support SQL Server, MySQL, and Canal‑based incremental replication.
At the iQIYI Technical Salon in Shanghai, senior engineers from iQIYI, Ele.me, Mushroom Street and others shared practical advances in mobile componentization and webization, including Ele.me’s hierarchical Android modularization, the open‑source CC framework, iQIYI’s Qigsaw dynamic delivery and Utopia web‑SPA, LiteApp performance optimizations, and the Lynx cross‑platform framework, while inviting developers to join iQIYI’s R&D team.
The Elasticsearch Team Development Constitution outlines a comprehensive set of principles and guidelines—covering design philosophy, code quality, interaction etiquette, and organizational responsibilities—to help the rapidly growing project evolve into a reliable, secure, scalable, and user‑friendly distributed search engine.
Ant Group engineers Yang Bing and Huang Ting discuss the evolution of their SOFA middleware platform—from early service‑oriented architecture to a full‑stack DevOps ecosystem—highlighting microservice governance, Service Mesh integration with Kubernetes/Istio, open‑source strategies, and the cultural emphasis on reliable, commercially‑savvy engineering talent.
This article introduces Hadoop’s origins and core challenges, then presents thirteen essential open‑source tools spanning resource scheduling, real‑time query engines, and additional processing frameworks, detailing each project's purpose, key features, and repository locations to help practitioners choose the right component for big‑data workloads.
An in‑depth interview with Jun‑ichiro Hamano reveals how he joined the Git project, the challenges of early merge implementations, the relationship between Git and GitHub, and the personal qualities Linus Torvalds values in top programmers.
