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.

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

testing and development teams around the world use smartbear's automation, development and monitoring tools to build better software and applications.

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。

market-leading mit licensed open source real-time operating system (rtos) for microcontrollers and microprocessors. includes iot and general purpose libraries.

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。

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.

lvgl is the most popular free and open source embedded graphics library targeting any mcu, mpu and display type to build beautiful uis. it's boosted by a professional yet affordable drag and drop ui editor, called squareline studio. we also do services like ui design, implementation and consulting.