Devspar: So, Fallout series, Arcanum, Temple of Elemental Evil, Wizardy 8. Got it. Anything else?
Geneforge, Avernum, Avadon on GOG and Nethergate from Steam or Spiderweb software's own website (should be cheaper on steam, Spiderweb has an odd pricing system).
The Realms of Arkania series, if you can live with the dated graphics and lack of user friendliness (I found 3 to be the best one).
Eschalon book 1 & 2, if you don't mind a solo experience.
The older Ultimas (pre 7), again, if you can live with the dated graphics & lack of user friendliness. I found 5 to be the best of these, but 4 is also solid. 1-3 have not aged all that well.
Also, it might be worth seeing if you can track down the old D&D Goldbox games. There are a few collections containing them, including
Advanced Dungeons & Dragons Collector's Edition,
The Forgotten Realms Archives &
Forgotten Realms Classics. Check amazon or ebay for these. The later two don't contain all goldbox titles, but they do contain plenty of other games, like the excellent (but not turnbased) Eye of the Beholder series.