Orba
Cadet
Good single-player RPGs for PC? Here's my list:
Baldur's Gate
Baldur's Gate 2
Any of the gold box games
Dark Sun: Shattered Lands
FFVII
Neverwinter Nights (Single Player)
Neverwinter Nights 2 (Single Player)
War of Genesis III
Magna Carta
There're probably more, but I haven't played more than this.
The Playstation/2 is the primary bastion of single-player RPGs, though. No contest.
Good list but you forgot
Fallout series
Ultima series (excluding Ultima Online)