Have there really already been four of these bundles? We first heard about The Free Bundle back in January, and since then they have been highlighting several interesting PC games, all of which are available for no charge. According to the countdown clock up above the current Free Bundle, the next set is ready to drop in about a day.
The games in this fourth bundle have had relatively little exposure, aside from the pixelated first-person shooter Mega Man 8-bit Deathmatch. Others in the group are the extreme action title Bear Surfin Mega Wave, 2D platformer You Have to Win the Game, stylish point-and-click adventure Dirty Split, and first-person puzzler Vicinity. It's quite an eclectic grouping, so there's a good chance you'll find something that suits your fancy.