SOGo - SOGo is groupware server with a focus on scalability and open standards.
Elevate - Elevate is an award-winning brain training tool designed to build communication and analytical skills.
Baïkal - Cal and CardDAV server
Peak - Peak is the automated way to keep track of what everyone is working on.
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
Brain Workshop - Brain Workshop is a open-source version of the dual n-back brain training exercise.