The following Infocom games are now freeware, and can be copied freely. Have fun!
Zork I : The Great Underground Empire
Zork II : The Wizard of Frobozz
Zork III : The Dungeon Master
Zork : The Undiscovered Underground
The following are based on Infocom games, and again can be copied freely.
[If anybody knows differently to the above, please let me know and I will immediately remove all copyrighted material from the site.]