Because I’m only allowed two free campaign sites, this is a placeholder for the numerous ideas I have for campaigns (other than the ones contained in my full setting) that I could GM:
Adventure in the North (The Lord of the Rings Rôleplaying Game (IRL preferred))
Belly of the Beast (Dragon Age Rôleplaying Game, 5th? level)
Choriopolitan Arcana (d20 Modern, 1st ECL)
The Fantasy Fellowship (see here) (The Lord of the Rings Strategy Battle Game (IRL only) or The Lord of the Rings Rôleplaying Game (IRL preferred))
Living Forgotten Realms (D&D 4th Edition): As it’s an open campaign that allows me to write my own adventures, this is the one that’s currently going on.
Marienburg in Flames (Warhammer Fantasy Rôleplay 2nd Edition (IRL preferred), starting careers)
Project Alpha (Warhammer 40,000 Rôleplay DARK HERESY (IRL preferred), 5,000 xp)
The Red Grot Revolution (Warhammer 40,000 Rôleplay, Inquisitor-styled (IRL only))
The Rubic’s Dome Inquisitor Campaign (Warhammer 40,000 Rôleplay DARK HERESY, Inquisitor-styled (IRL only))
Shiki (Pathfinder RPG, 2nd ECL)
Undead Greyhawk (Pathfinder RPG, 1st ECL)
You can see here for information about games and how I play them.