Baïkal - Cal and CardDAV server
eMule - eMule is a free peer-to-peer file sharing application for Microsoft Windows.
Radicale - The Radicale Project is a complete CalDAV (calendar) and CardDAV (contact) server solution.
aMule - aMule - the all-platform P2P client!
DAViCal - DAViCal is a server for calendar sharing.
Fopnu - Fopnu is P2P File Sharing System. 100% Free, Simple and Easy to Use. Contains NO Spyware and NO Ads.