Shippy 1984

Wow, this is an old game. It resembles Galaga. You're a ship and you fire at falling enemies.

Outpost

This is an unfinished but fully playable demonstration program ported from the PC intended to help the beginning developer get started writing games for the Tapwave Zodiac.

Angband

One of the first RPG's, and sill considered one of the best. It's completely based on standard characters such as @, #, and *.