The only ones I'm familiar with that people actually play for reasons other than the novelty/political statement of playing a FOSS game are ASCII roguelikes (mo

The only ones I'm familiar with that people actually play for reasons other than the novelty/political statement of playing a FOSS game are ASCII roguelikes (most notably Nethack) and a menagerie of remakes of commercial games that have now surpassed the originals in features, graphics, and system compatibility (OpenTTD, OpenXCOM, etc.)