Legends of Boxing is a free print-and-play sports game. It has lots of stats for historical boxers and a campaign mode.
Misc
Postcard Empire Pirnt-And-Play
Postcard Empire is a free print-and-play boardgame for 2 – 4 players. As the name suggests, the game board fits on a postcard, while the rules fit on the back. The black-and-white pdf is free. The site also sells a very inexpensive color postcard.