Linux
For the community, by the community, Linux.com is the central source for Linux information, software, documentation, how-tos and answers across the server, desktop/netbook, mobile, and embedded areas.
PHP
Server-side HTML embedded scripting language. It provides web developers with a full suite of tools for building dynamic websites.
SourceForge
SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory.
Linux Online
Comprehensive information and resources about the Linux Operating System.
redhat.com
Red Hat is the world's leading open source technology solutions provider with offerings including Red Hat Enterprise Linux, open source applications, security and systems management, virtualization, Services Oriented Architecture (SOA) solutions.
中国IT实验室-嵌入式开发频道
中国IT实验室-嵌入式开发频道提供最全面的嵌入式开发培训信息以及行业动态及与技术信息，下设栏目包括：业界动态，嵌入式操作系统，网络与通讯，手机开发，解决方案，资料下载，ARM技术，单片机，DSP技术，FPGA技术，PCB设计等海量文献，以及嵌入式开发文档、嵌入式开发教程等相关资料下载，致力打造中国最大的嵌入式开发网站。
Python Programming Language
Python is a programming language that lets you work more quickly and integrate your systems more effectively. You can learn to use Python and see almost immediate gains in productivity and lower maintenance costs.
Python中文社区
CPUG是中国第一个正式成立的Python用户的民间组织，在广大Python爱好者的推动下为宣传和发展Python而成立的。 现在CPUG提供 Python相关的资源和服务，有兴趣可以加入我们并使用我们的服务。我们接受各种支持和赞助，同时也愿意与您合作，一同致力于Python的发展。
CodeIgniter
CodeIgniter: an open source Web Application Framework that helps you write PHP programs.