Not sure if you're aware or not, but this is evidently Free PDF Weekend. Here's the games/products I've found for download thus far. This isn't an endorsement of any product, mind, just a listing, but hey, free is free. Happy hunting, and may you find something that you dig!
Phrenic Creations: Memory Crystals (Dreamscarred Press)
Supers, Inc. (HinterWelt Enterprises)
Bits of Magicka: Pocket Items (Tabletop Adventures)
Dunsany's Book of Wonder (Creative Mountain)
The Monstrous Societies of Argyle (Silver Oak Studios)
This is supposeed to run through this Monday, September 3rd. I know a lot of companies out there already have great supplements or RPGs out there for free 24/7, but I still think this is a great idea, and I'd love to see more companies jump in on this. Nothing like a limited-time special offering to get folks excited!
If you see anymore pop up that I've missed, please, pass them along!