Better late than never!
Morrowind leads the way narrowly from Divine Divinity. Games with 5 or more include Gothic 1 and 2, Baldurs Gate 2, KOTOR 1, Fable and Neverwinter Nights.
About 110 games mentioned, including a whole heap I have never heard of.
Suprises? Perhaps Outcast with only 2 votes so far. I am sure there are others.
Kepp em coming