Doomling is a Doom clone for the Palm.

"Welcome to DOOMling.com - the official place to wait for the release of the best palmOS game, bar none. With full grayscale rendering, sound, many weapons, enemies and options, it has to be seen to be believed! Complemented by a Windows level editor and the continuing development of Two Player Infrared Deathmatch, James McCombe's DOOMling is the most eagerly anticipated Palm release of the year. Current expected release date is 5th April 2000."

http://www.doomling.com/