Tatami

Tatami is the free mobile client for the Tatami webapp, which allows colleagues to communicate with each other and enjoy the familiar social network experience in the work environment.Users are separated by their email domains, for the workplace, this means that each company can have all their information available only to coworkers.
The Tatami app can either use a free hosted version, available at app.tatamisoft.com, for the mobile app to communicate with, or you may change the server you would like to use.
Tatami is open source, and allows users to deploy their own instance.
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