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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.
C# Corner
C#, Visual Studio 2008, Silverlight, ASP.NET, WPF, WCF, WF, and Windows Vista Community.
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.