The Temple of Elemental Evil [ToEE] is a licensed Dungeons & Dragons RPG that was first released in 2003 by Atari. It is based on the Greyhawk campaign setting and uses the D&D 3.5 edition ruleset.
One look at The Temple of Elemental Evil and you’re going to think: “Baldur’s Gate“… Because it very much looks and plays like that particular game. That said: the game does have some heritage in the Fallout series, because Tim Cain (the lead designer on the original Fallout games) was also director of this.