Kandan - Modern Open Source Chat

What is Kandan?

Kandan is a private chat service for your company or team. You can invite colleagues to share ideas and files in a persistent group chat room or rooms.

Unlike HipChat or other alternatives, Kandan is completely Open Source and can be hosted internally or externally by your organization or by a third party.

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See:
http://alternativeto.net/software/kandan/
for a list of similar services.