Wow, there are almost 600 games in ifarchive, and even more than 50 in my mother language! Entertainment for ages!
Had to edit one of the scripts though, the path wasn't complete (I think a "bin/" was missing in start_frotz_shell.sh, but I'm not 100% sure now).
Thanks for opening the doors of this Z-Machine universe to the KT.
Edit for Spanish speakers: apparently there's an active community that still develops for Z-Machine, here you can find more than 100 games: http://www.caad.es/taxonomy/term/21