I know, I play IF games since 2001 and 2002; and my previous gameplays where with the classical ones for ZX Spectrum (in Spanish) and some freeware games bundled with 'shareware' CD's with Winfrotz and later Frotz/NFrotz. Some GNU user used to have several under libre licenses (even non-ZMachine ones), such as Beyond the Titanic, but he has no working repos any more.