Xu4

xu4 is an open-source project focused on the playability of Ultima IV on modern systems. Their engine uses the original data files from the game. It is still in the process of development, though it is mostly complete. The engine's primary goal is to recreate the original Ultima IV with 100% accuracy while also providing many optional bonus features to improve the enjoyment of the game.

New features include sound effects, an advanced menu, and the ability to tweak gameplay for maximum enjoyment.