There is a pre-made, high fantasy setting with an official adventure. It's included in the 10th Anniversary edition. On top of that are various unofficial pre-made high fantasy settings, various unofficial adventures, and other similar things. Fudge is also a fairly simple system mechanically unless you deliberately complicate it, which means that you can take adventures from other games.

Depending on your definition of "high fantasy" it might also be worth having a look at Hack-n-Slash, which includes an adventure in its expanded GM edition. The game is set up as quite a traditional D&D-style RPG, with quite a few magical spells, monsters and the like.

I know there is Blood, Sweat, and Steel, but I do not know if the rulebook has been released online or anything. Can't find any links.

It's currently unfinished, and exists in a private drop box, several hard drives, and various emails. I'm pretty sure permission to use it and a copy can be made pretty easily, but it isn't quite pre-made as it still needs playtesting, it's sword and sorcery instead of high fantasy, and there are no pre-made adventures yet.

Thanks for all of the great feedback! I'll definitely be checking out the systems mentioned