PokerTH is a poker game written in C++/Qt. You can play the popular Texas Hold'em poker variant against up to nine computer-opponents or play internet games with people all over the world. This poker engine is available for Linux, Windows and Mac
Open Source Client/Server Network Backup System
Efficient Client-Server Backup system for Linux, macOS and Windows. A client for Windows, macOS and Linux lets you backup open files and complete partition images (Windows). Backups are stored to disks in a efficient way (deduplication) on either Windows or Linux servers.
Diverse P2P Filesharing
PeerProject is a versatile peer-to-peer filesharing client and file manager. Intuitive and aesthetic while supporting many networks and features. BitTorrent, G2, Gnutella, eDonkey, DC++, IRC, http/ftp & more. Mainstream fork of Shareaza p2p, for Windows & WINE. (See Envy fork for further development.)
Refined P2P Filesharing + BitTorrent
Envy is a powerful multi-network p2p filesharing and torrent client for Windows or Wine. A mature mainstream fork of Shareaza. Highly skinnable, with BitTorrent/DHT, G2/Gnutella², Gnutella, ED2K/eMule, DC++, http/ftp protocols -and blacklist support baked in. Let others browse your public files.
Zarafa is a complete replacement for MS Exchange under Linux. Zarafa has a full featured AJAX based webaccess which is completely in the Outlook "Look & Feel".