A classic. If you like role-playing games and haven't played this one yet, here's your chance.
There's also an expansion pack, Tales of the Sword Coast, which adds several new quests, items, spells and some interface improvements as well as a multiplayer option, which does not work in Classic.
Followed by Baldur's Gate II: Shadows of Amn.
Here are links to the Toast images as external downloads.
Tales of the Sword Coast
Doesn't run in Classic mode on versions higher than 10.3.
May be troublesome in SheepShaver.