eMule - eMule is a free peer-to-peer file sharing application for Microsoft Windows.
SOGo - SOGo is groupware server with a focus on scalability and open standards.
Fopnu - Fopnu is P2P File Sharing System. 100% Free, Simple and Easy to Use. Contains NO Spyware and NO Ads.
Baïkal - Cal and CardDAV server
Shareaza - Shareaza is the most luxurious and sophisticated file sharing system you'll find.
Xandikos - Lightweight CalDAV/CardDAV server on top of Git.