Developer: BioWare
Release Date: September 21, 2000
Source Code Release Date: Not formally released
The sequel to the original, Baldur's Gate II: Shadows of Amn is bigger and more ambitious than its predecessor. This source port will also play the expansion pack, Baldur's Gate II: Throne of Bhaal, which is usually included in modern digital repackagings.
Note that GemRB requires the files from the original game, not the Enhanced Edition, however digital retailers such as GOG will also include the regular edition when you purchased the Enhanced Edition.
NOTE: although this build of GemRB is signed and notarized, you may still experience issues with Gatekeeper on launch. While I'm still investigating why this happens, shortest answer is to right-click on the app bundle (gemrb.app) and select Open. The long answer is here.