Free Palm Games

Open Chess for Palm OS
Chess game for Palm. Uses GNU chess engine. Supports color devices. Freeware.
http://www.geocities.com/sonaltessefr/

PalmLinez
The goal of the game is to build up horizontal, vertical, or diagonal lines consisting of five or more one-style balls. Freeware.
http://www.chinyue.com/palm/palmlinez.html

Sink the Ship
Sink all the ships of your enemy (Battleship clone). Freeware.
http://www.mulliner.org/palm/sink_the_ship.html

Super Tic Tac Toe
The regular old game. Play against the PalmPilot computer or another human player. Freeware.
http://worldexperience.com/palm/

Tiller Software Pilot Page
Two freeware logic board games for Palm. Fours goal is to put four tokens in a row, playing with a computer or human opponent. Marbles is a classic puzzle game, the goal is to remove all marbles from the board.
http://michiel.tiller.com/pilot/