Dragonsfoot is a website claiming to be the "home of First Edition Advanced Dungeons & Dragons!"
Dragonsfoot real claim to fame is that their material is "All produced to a professional quality and offered to you completely free of charge!"
There are a lot of great GM aids on their site, and a good many of them don't require you to be running 1st Edition AD&D. In fact, there is product support for 2nd Edition, Savage Worlds, Castles & Crusades, Legendary Adventures......the list literally goes on.
There are some great adventures to download and I'm a huge fan of their e-zine Footprints.
If you cannot find some useful materials for your Fantasy RPG game here, then you should really just stick to playing.