SourceForge
SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory.
CodeProject
Free source code and tutorials for Software developers and Architects.
Dr. Dobb's
Software tools and techniques for global software development. Dr. Dobb's features articles, source code, blogs,forums,video tutorials, and audio podcasts, as well as articles from Dr.
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.
FreeBSD中文社区
ChinaUnix FreeBSD社区为网友提供最新的FreeBSD资讯、技术文档，同时为广大FreeBSD爱好者提供一个方便的交流社区。
嵌入式开发者网
嵌入式开发者网(Embedded developer)，是嵌入式开发工程师处于嵌入式开发周期中，芯片评估阶段的优选网站。它将帮助中国本地的嵌入式>开发工程师在嵌入式开发过程中找到适用于自己的嵌入式开发难题的最佳解决方案，并为嵌入式开发创新和嵌入式开发研究留出更多的时间。
Ubuntu
Super-fast and great-looking, Ubuntu is a secure, intuitive operating system that powers desktops, servers, netbooks and laptops. Ubuntu is, and always will be, absolutely free.
openSUSE
openSUSEopenSUSE 是一个自由的、基于Linux的操作系统，适用于您的个人电脑、笔记本电脑或服务器。您可以畅游网络、管理您的电子邮件与照片、办公、欣赏视频与音乐。