ProphetSword
Arcane
If you're looking for premade RPGs that have custom toolkits allowing you to create an RPG, here are all that I can think of off the top of my head:
Forgotten Realms Unlimited Adventures
Dungeon Craft (in development)
IceBlink Engine
Neverwinter Nights
Neverwinter Nights 2
Neverwinter Online
Fallout 3
Morrowind
Oblivion
Skyrim
Shadowrun Returns
Divinity: Original Sin
Arcanum
The Bard's Tale Construction Kit
RPGMaker
Dungeon Siege
I'm sure there are others. Maybe this will get you on the path to where you need to be. You clearly want to create an RPG using someone else's system versus creating your own. Nothing wrong with that, I guess, as plenty of us have done it over the years. You might find your design lost in the mass of hundreds of others if it's not original enough or interesting enough to stand out (unless you use "The Bard's Tale Construction Kit," in which case your competition will be minimal).
Forgotten Realms Unlimited Adventures
Dungeon Craft (in development)
IceBlink Engine
Neverwinter Nights
Neverwinter Nights 2
Neverwinter Online
Fallout 3
Morrowind
Oblivion
Skyrim
Shadowrun Returns
Divinity: Original Sin
Arcanum
The Bard's Tale Construction Kit
RPGMaker
Dungeon Siege
I'm sure there are others. Maybe this will get you on the path to where you need to be. You clearly want to create an RPG using someone else's system versus creating your own. Nothing wrong with that, I guess, as plenty of us have done it over the years. You might find your design lost in the mass of hundreds of others if it's not original enough or interesting enough to stand out (unless you use "The Bard's Tale Construction Kit," in which case your competition will be minimal).