Virus Bulletin
Independent malware journal and website with advice, reviews and tutorials.
The Metasploit Project
The Metasploit Framework is the open source penetration testing framework with the world's largest database of public, tested exploits.
千易文件分享
不需要注册的免费上传空间,用Google、MSN、人人网账号即可登录。无空间大小限制，文件永久保存，高速稳定的上传和下载速度，并提供下载统计、论坛调用、迅雷下载等丰富的扩展功能。
Open Directory Project
Help build the most comprehensive human-reviewed directory of the web.
Open Directory
Open Directory - Free URL Submission, Free Search Engine Submission ...
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.
SourceForge
SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory.
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。