Development is mainly coordinated via IRC and the mailing list. Be sure to visit both once in a while or you might miss critical stuff.

Mailing List

supertux-devel@lists.lethargik.org - List for comments, criticisms and everything development related

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supertux-commit@lists.lethargik.org - List for commits to SVN, mainly useful for people working directly with the source

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IRC

Server: irc.freenode.net
Channel: #supertux