Veritable - An introductory level WWII war game. Perfect Captain, The - Miniature rules, campaigns, and boardgames. Very popular right now. Also see Mafia link above. White Mask - Another site offering free games.
All games are complete with rules, cards, game boards, and chits.
Currently offers a game called Battle Platform Antilles and has an upcoming game called Doubloon Lagoon. The designer requests a small donation if you like his games. Bronze Age Sea Trade - Shareware game. The author of the game would like you to try his game out. More games in the works.