This fan made mod of Neverwinter Nights 2 may give Beamdog and Baldur's Gate: Enhanced Edition a run for their money.
Designer Drew Rechner and his team have been working on Baldur's Gate: Reloaded, a mod based off of Neverwinter Nights2 since 2006. Reloaded recreates the experience of the game in 3D. Though Reloaded might not be the most up-to-date looking game (Neverwinter Nights 2 is now 7 years old) but the sheer amount of work that the team's put into the development is impressive.
Baldur's Gate: Reloaded requires Neverwinter Nights 2 and its expansions Mask of the Betrayer and Storm of Zehir to run. It's free for download through Nexus Mods here.
To get an idea of how the mod looks, here's the launch trailer that Rechner's uploaded to YouTube, below: