Virus Bulletin
Independent malware journal and website with advice, reviews and tutorials.
SANS
Computer security training, certification and free resources. We specialize in computer/network security, digital forensics, application security and IT audit.
EveryDNS
EveryDNS.Net provides free DNS and backup MX services. This includes Static DNS, Dynamic DNS and URL Redirection!
Hurricane Electric Hosted DNS
Welcome to the Hurricane Electric Free DNS Hosting portal. This tool will allow you to easily manage and maintain your forward and reverse DNS.
DNSEver
DNSEver provides Free Web-based DNS (Name Server) services. Complex system management is not needed for DNS setup. Convenient DNS service can be used immediately by entering the domain name and IP address.
博客园
博客园是面向软件开发者的高品质网络媒体和社区，博客园一直致力于为开发者打造更优秀的网络平台，让开发者在这个平台上更努力的学习、更尽情的分享、更快捷的交流、更迅速的成长、更好地用技术改变世界。
GlobalSSL
专业提供全球可信的SSL证书, EV SSL证书, 代码签名证书, x64(64位) 驱动签名证书, 电子邮件签名证书, PDF文档签名证书(Adobe CDS), 各类数字证书应用及PKI解决方案。
自学人
自学人，自学不求人！专业的自学视频教程网，我爱自学，我要自学就上自学人网！自学人提供office办公软件教程系列、Photoshop教程、AutoCAD教程、3dmax教程、Vray渲染教程、室内施工工艺教程、色彩配色教程、建筑CAD制图教程、土建施工视频教程、Revit视频教程、sketchup教程、Lumion教程、新概念英语视频教程等各种教程。是最专业的视频自学网站。爱自学，要自学就上自学人网。
DevX
DevX is the leading provider of technical information, tools, and services for IT professionals developing corporate applications.
SourceForge
SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory.