NetMage is a Java-based game that lets two people play Magic: The Gathering (or other card games) over a TCP/IP connection. It does not know how to play the game, but it does let you play if you know how (a la Apprentice).
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.