MEHEM is a reinterpretation of the endings of Mass Effect 3, which allows Commander Shepard to survive the final mission, among many other changes. It features custom videos and slides, re-engineered gameflow, original as well as re-arranged voice acting, new music, etc.
An installer for MEHEM v0.3. The installer automatically creates a backup of all your files and is also packed with an uninstaller which will restore the vanilla version of the game.