Zork? I prefer advent and Spider and Web. Just kidding, I'd put Rogue/Nethack and Slashem too. Thanks to Rogue we have Curses and NCurses. Also, Eliza and Megah

Zork? I prefer advent and Spider and Web. Just kidding, I'd put Rogue/Nethack and Slashem too. Thanks to Rogue we have Curses and NCurses. Also, Eliza and Megahal plus Markov Chains.