sourceforge provides free & fast open source software downloads and development, and business software reviews and comparisons featuring the largest open source and business software directory.

github is where over 100 million developers shape the future of software, together. contribute to the open source community, manage your git repositories, review code like a pro, track bugs and features, power your ci/cd and devops workflows, and secure code before you commit it.

sourceware free software

stack overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers.

极术社区致力于连接开发者与智能计算生态。提供人工智能、物联网、嵌入式开发、soc芯片设计、自动驾驶、服务器与云计算等智能计算技术领域的资讯、知识及教育培训、会议活动，与合作伙伴共建中国智能计算生态。

博客园是一个面向开发者的知识分享社区。自创建以来，博客园一直致力并专注于为开发者打造一个纯净的技术交流社区，推动并帮助开发者通过互联网分享知识，从而让更多开发者从中受益。博客园的使命是帮助开发者用代码改变世界。

wind river, a global leader of software for the intelligent edge, is accelerating digital transformation of mission-critical intelligent systems.

面向企业提供一站式研发管理解决方案，包括代码管理、项目管理、文档协作、测试管理、cicd、效能度量等多个模块，支持saas、私有化等多种部署方式，帮助企业有序规划和管理研发过程，提升研发效率和质量。

菜鸟教程(www.runoob.com)提供了编程的基础技术教程, 介绍了html、css、javascript、python，java，ruby，c，php , mysql等各种编程语言的基础知识。 同时本站中也提供了大量的在线实例，通过实例，您可以更好的学习编程。..

keil makes c compilers, macro assemblers, real-time kernels, debuggers, simulators, integrated environments, evaluation boards, and emulators for the arm, xc16x/c16x/st10, 251, and 8051 microcontroller families. this web site provides information about our embedded development tools, evaluation software, product updates, application notes, example code, and technical support.