Mod Organizer
Mod Organizer is a tool for managing mods for various games.
Mod Organizer (MO) is a tool for managing mod collections of arbitrary size. Supported games are currently Oblivion, Fallout 3, Fallout New Vegas and Skyrim.
It is specifically designed for people who like to experiment with mods and thus need an easy and reliable way to install and uninstall them.