CodePlex

CodePlex was a forge website by Microsoft. While it was active, it allowed shared development of open-source software. Its features included wiki pages, source control based on Mercurial, TFVC, Subversion or Git, discussion forums, issue tracking, project tagging, RSS support, statistics, and releases.

While CodePlex once encompassed a wide variety of projects, including SQL Server, WPF and Windows Forms-related projects, its major activities were focused on .NET Framework (including ASP.NET) and SharePoint. The most prominent and used project that was born inside CodePlex, the AJAX Control Toolkit, is a joint project between the community and Microsoft.