It's also not that hard to get your hands on the Z-Code files of Infocom games and run them in a Z-Code interpreter. (Note, however, that they are still under copyright. Also, for some games, you'll also need a copy of the original docs or other material from the packaging as Infocom sometimes used info in the docs, decoder wheels, etc. as a low-grade anti-piracy technique.)
Agree that Planetfall is one of the better ones. Steve Meretzky also wrote A Mind Forever Voyaging which I really enjoyed although it's somewhat atypical of Infocom games in a few ways.
Agree that Planetfall is one of the better ones. Steve Meretzky also wrote A Mind Forever Voyaging which I really enjoyed although it's somewhat atypical of Infocom games in a few ways.