http://gamejolt.com/community/jams/
Game Jolt Weekend Jams are little events where we get together to make games, work on existing game projects, or create resources such as music and graphics (to be used in collaborative game projects) over the course of a selected weekend. There are no prizes or rewards involved (except perhaps a featured game or two on the front page of GJ); the focus is on collaborating together, sharing our creations live, and having a jolly good time in the process!
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