I had made a similar thread on one of my friend's forum and I thought I'd do it again here. Basically, I'll make a complied list of RPG resources as well as free (and legal, that is the most important part) games! Enjoy!
Print Free Graph Papers.
Free character sheets for a lot of RPGs.
Maps and random map generators.
Lists of fantasy names of all type.
A D&D city generator. Seems to be dead...
List of names by nationality.
Some riddles for your games.
Fan made Burning Sands book for L5R.
Future Shadows. Free Sci-Fi game.
Icar. Another free Sci-Fi game.
Numerous resources for D&D.
Name generators for characters, inns, items, etc.
Various resources for D&D, and a setting: The world of Gaia. (You might have to click this one a few time to get it to work properly...)
More riddles. (scroll down a bit...)
Edit: if any of the links are dead please tell me, either in this thread or via PM. I'll try and fix them via waybackmachine.