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Walkaround - Walkaround is a variant of Wave, based on the Apache Wave code base, that runs on App Engine.
Shtuff Chat - Free Group / Team chat with persistent history.
Rizzoma - Email and IM are linear contextless communication tools.
Meet in Chat - Meet new people. Have fun sharing photos.
Slack - A messaging app for teams who see through the Earth!
Kandan - Open Source private chat server. Your own private Chat server in minutes, plus additional features.