The following content has been created by various different authors and put together by FilePlanet:

Mavroshs Facticius Humanus Race Mod
The 'Facticius Humanus' or artificial human was born as a human but during childhood had certain changes and implants. The race is male only for some reason.

Download - 139.7 MB

Jessi Companion Mod
There are several different girl companion mods to pick from now in Fallout 3, but Jessi has her own ranged and melee weapons and many customisations including her own outfits and even a slave collar. You'll find her around Rivet City Markets.

Download - 105.2 MB

Terminator Cybernetic Dawn Mod
Become a part of the battle between Skynet and the Resistance. The mod comes with six playable races, companions, new weapons and armour and even more Terminators.

Download - 382.8 MB

Freddy Mod
We're not sure if Elm Street features in Fallout 3 but with this mod you can recreate Freddy Krueger.

Download - 26 MB

TYPE3 Female Body Replacer Mod
This mod isn't just aimed at companions - this is a female body replacer that will overwrite all the female skins in the game.

Download - 75.6 MB

These are just a few of the mods available on FilePlanet which include quests, skins, maps and a whole lot more.

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Source:	Fallout 3 Companion Mods
Related:	Fallout 3 mods to try before the nuclear apocalypse