iRogue is a game for the PalmPilot (or other handheld computer that runs the Palm OS). It is open-source freeware available under the GPL. It is derived from two versions of rogue (rogue 5.3-clone and urogue).
Rogue is old, for a computer game. This means that either (a) you have never heard of it or (b) you get all misty-eyed and nostalgic when reminded of it. Its many descendants are known as "rogue-like" games. These games are text-based and have a familiar premise: wander around in a dungeon, collect treasure, deal with bad-tempered monsters, try to finish a quest.