OpenPref is an open source implementation of European trick-taking game
Preferans (also known as Preference). It is written using cross-platform
Qt4 framework and is portable between many operating systems including
Windows and major Unix flavours.
WWW: http://openpref.sourceforge.net
PR: based on ports/150509
Submitted by: Konstantin Tokarev <annulen at yandex.ru>
