OpenPref is an implementation of Preferans, a European trick-taking game against two virtual players. Currently it allows you to play the Sochi version of Preferans, allowing you to change some game conventions. Two alternative AIs are available.
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.