freepuzzlearena is a popular puzzle game suite for the GNU/Linux, Windows, and DOS platforms. It's free software licensed under the GNU GPL. It's powered by the Allegro game programming library and GCC compilers such as DJGPP and MinGW.
Included are Tetanus, a clone of Tetris; Zeus, a clone of Zoop; Vitamins, a clone of Dr. Mario (NES), Vitamins 2, a clone of Puyo Puyo; Hampsterdeath, a shooting game inspired by Hampsterdance; and two other games.
Pick it up at PinEight.com