Dungeon World is another widely popular Apocalypse World hack that can stand on it’s own two feet. The game has quite a following to boot! The folks over at Bundle of Holding just launched a great collection of books and adventures for Dungeon World. For well under $20 you can get over 1,500 pages of DW goodness.
I can atest to the DW rules being solid and fun. Definitely well worth the price of admission. I have played DW a few times and everytime it was a great experience. I look forward to more DW games in the very near future. Now to find a little extra cash to buy this bundle.