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.
Linux时代
Linux时代是中国最大的Linux应用与开发人员的专业社区，栏目包含Linux新手，Linux安装，Linux管理员，Linux开发者，Linux桌面，Linux编程，Linux数据库，Linux网络技术，Redhat，Fedora，Ubuntu，SuSE，Unix，debian。
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。