I think I can safely assume that everyone knows about SourceForge.net, where first-class .NET projects such as NUnit, NAnt, NProf as well as many others are hosted. Much less known is GForge, which is a fork that you can host yourself based on the GPL version of SourceForge before it was made closed-source by VA Linux in 2001.

Since that time GForge was improved, and it has reached version 4 just recently. To give you a really high-level idea of what it is, a short quote from the project page itself:  GForge has tools to help your team collaborate, like message forums and mailing lists; tools to create and control access to Source Code Management repositories like CVS and Subversion. GForge automatically creates a repository and controls access to it depending on the role settings of the project.

Additional Tools:

• Manage File Releases
• Document Management
• News announcements
• Surveys for users and admins
• Issue tracking with "unlimited" numbers of categories, text fields, etc
• Task management

Tool-wise, this package can come in handy when you want to get started on a development process in your company, covering the entire lifecycle. For free.