Also Humble Bundle is having a bundle with Might & Magic games.
Book of Lairs - 26 monster lairs (and some new monsters) for the ACKS game. Strangely priced at $7.83 and 74 pages.
The Dreams of Ruin - The PDF is free, but now you can get it in print. Couldn't make it through the PDF, much too artsy for my taste.
The First Sentinel - 3rd to 5th level Labyrinth Lord adventure. 39 pages, $6.99
The Sorcerer's Tome - Another 3rd to 5th Level adventure, this time for Swords & Wizardry. 14 pages, $1.50
Lesser Gnomes's Creature Catalog - Free PDF of new monsters from their modules, Labyrinth Lord stats.
Outer Space Raiders: The Norni - A new alien race for White Star. 8 pages, 99 cents.
Powers of the Mind: Free Starter Edition - If for some crazy reason you play ACKS, and for some crazier reason you want to add psionics to it, well, here you are. (In either event, my condolences)
Dungeons in Blue: Triple Expansions Pack One - $8.79 for some dungeon maps.