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Global Game Jam is a yearly game jam where developrs from all over the world are able to participate in teams to create a game with a shared theme.

My First Game Jam is an online jam focused on you creating your first game with tools you've always wanted to learn. It's for people of all skill levels to learn something new! Absolute beginners encouraged to join.

PROCJAM is the Procedural Generation Jam, an annual event about making things that make things.

http://www.procjam.com/