The GPL version of the Quake II engine has been used to make a few games: https://en.wikipedia.org/wiki/Quake_II_engine#Games_based_on_the_GPL_source_release h

The GPL version of the Quake II engine has been used to make a few games: https://en.wikipedia.org/wiki/Quake_II_engine#Games_based_on_the_GPL_source_release https://en.wikipedia.org/wiki/Quake_II_engine#Games_based_on...