GemRB (Game Engine Made with pre-Rendered Background) is a portable
open-source implementation of Bioware's Infinity Engine.

It was written to support pseudo-3D role playing games based on the
Dungeons & Dragons ruleset (Baldur's Gate and Icewind Dale series,
Planescape: Torment).

This is not a game, but the engine. You need data installed somewhere, and
point gemrb the the relevant directory. More details and a list of
supported games can be found at www.gemrb.org