dProjects is a really simple centralized web and rsync based version control system for small groups. The clients can initiate the file movements from the web interface.
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The OpenOCS project is groupware software which allows groups to work on projects. Client/Server architecture written in Java with a MySQL database and PHP front end.
Mole is a project started in 2008, designed for allowing users to easily share all kinds of ressources.
It is planned to be used as a Mozilla Firefox extension.