Seven Cities of Gold was an extremely cool adventure game released in the 80s that was highly addicting. The goal of the game from wikipedia, "The player takes the role of a late-15th century explorer for Spain, setting sail to the New World. The player has options to equip and purchase food for the vessel, and to hire men and crew to sail with. Once sailing, the player guides the ship to the New World, then explores the ...

By "GTA-Like" I mean a very open-ended non-linear action game with RPG elements where you do various missions and gain money/items/experience. The Grand Theft Auto games are a good blueprint. You could be a bounty hunter doing missions for Jabba or a Jedi doing missions for the jedi council or Vader.

I think there's a lot you could do with this and it would be a lot of fun.

Archon was an extremely cool game for the C64, that was similar to Chess but each piece for each side was a different creature that had different powers, and when you tried to "take" one of the other pieces/places it took you to another screen where you had to actually fight the other piece. It was extremely well done and addicting. Each piece had different powers and abilities.

I think this would be an extremely cool game ...

There are not enough non-linear role playing games these days. Almost every RPG that has come out lately is practically on rails. There's really only 1 path to take to win the game.

There needs to be more open-ended RPGs that allow you to go anywhere at any time, even if it means you might die a horrible death because you're trying to do something that you're not strong enough to do yet.

There needs to be more choices in RPGs that effect the storyline and make it more dynamic in nature....

The basic concept of Urban Dead but non-web based. A real 3d-engine powered game where players can either be human or zombies. When humans are killed by zombies they become zombies, etc.