Rock - Rock is a People/Groups/Relationships & Church Management System
The Spark Development Network is developing a first-class, open source Church Management System (ChMS) / Application Framework called Rock. It's an ASP.NET 4.5 C# web application that uses Entity Framework 6.0, jQuery, Bootstrap, and a whole bunch of other openly available libraries. We're planning a beta release for January 2014.
Our main developer starting point site is the wiki.
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You can also read our press release if you're into that sort of thing.