eMule - eMule is a free peer-to-peer file sharing application for Microsoft Windows.
Baïkal - Cal and CardDAV server
Fopnu - Fopnu is P2P File Sharing System. 100% Free, Simple and Easy to Use. Contains NO Spyware and NO Ads.
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
Emule Beba - Originally beba was concepted as a "light" eMule version.
SOGo - SOGo is groupware server with a focus on scalability and open standards.