The following D&D PC games are all set in the same world as the Baldur's Gate series:
- Icewind Dale and its expansions Heart of Winter and Trials of the Luremaster (available on GOG.com)
- Icewind Dale II (available on GOG.com)
- Neverwinter Nights and its expansions Shadows of Undrentide and Hordes of the Underdark (available on GOG.com)
- Neverwinter Nights 2 and its expansions Mask of the Betrayer and Storm of Zehir
The following D&D PC games are not set in the same world but use the same engine or similar gameplay/atmosphere:
- Planescape: Torment (set in the Planescape universe, same engine as BG/IWD series) (available on GOG.com)
- The Temple of Elemental Evil (set in the world of Greyhawk, fully turn-based) (available on GOG.com)
A few weeks ago Dungeons & Dragons: Daggerdale was also released, developed by Bedlam and published by Atari. It is set in the same world as the BG/IWD/NWN series but is much, much more action-oriented and it was trashed by critics and fans alike. Meanwhile, as mentioned above, Cryptic continues development on Neverwinter which will be a story-driven online multiplayer role-playing game (not an MMO, mind you) and it remains to be seen how faithful it will be to its predecessors, or if it will play anything like the classic RPG's of the late '90s.
Dragon Age: Origins and its expansion Awakening deserve special mention here, as that series was indeed the "spiritual successor" to the BG games, and developed by the same developer, BioWare. Those titles are probably the closest we've gotten to a "sequel". Dragon Age 2, sadly, strayed from this concept drastically and was a major disappointment.
Of all the above-mentioned titles, I'd say you're likely to get the most enjoyment out of the Icewind Dale (1 and 2) and Neverwinter Nights 2 series. They are the closest to the BG games in terms of gameplay and atmosphere.
Hope this helps.
Edit: Of all the developers out there I think that Obsidian Entertainment, who developed the NWN2 games, are most likely to give us another classic D&D CRPG -- they already have a working relationship with Atari and Wizards of the Coast, and their CEO has talked about re-visiting the Icewind Dale and Planescape: Torment franchises several times in the past few months. My money would be on Icewind Dale III.
Post edited June 15, 2011 by Lorfean