I am not sure how many here know of what Garry's Mod is, but the basic explantation is that its a sandbox mod utilizing the Source engine, which was used for a lot of games by Valve, including "Half-Life 2", "Team Fortress", "Counter-Strike: Source" and "Left 4 Dead" and "Left 4 Dead 2." Well, for this mod, many of people have imported models from various different games and sources to add into the mod.

Well, over at Garry's Mod.org, they've got links for various "Tron" related items that have been either straight forward ported in from games or scratch built. Here are just some of them.

Tron: Legacy - Light Cycle
Tron: Legacy - Flynn's Light Cycle
Tron 2.0 - Jet's ID Disc
Tron - Recognizer
Tron 2.0 - Jet Ragdoll
Tron - Tank
Tron - Light Cycles
Tron - Light Cycle (High Poly)
Tron - Light Cycle Grid Map
Tron 2.0 - Ma3a Model
Tron 2.0 - The LOL Gun
Tron- Bit Model (Neutral, Yes and No)
Tron 2.0 - Mercury Ragdoll

Some of the users at Facepunch, the forums for "Garry's Mod" have talked about possibly importing more models from the game "Tron: Evolution", but I don't know if they will at the current time or not. But these are available for right now (you must have a Garry's Mod.org account).