There are several places you can go to check out some mods for the Fallout series. The best place to start your search is the site No Mutants Allowed. Here is the link:

No Mutants Allowed

On the top menu, select community, and then downloads. It will take you to a screen where you can downloady everything Fallout related.

Enjoy and happy gaming!

Oh, here is the link to Fanmade Fallout:

Fanmade Fallout