Produced by: Andrew Taylor, Darren Janeczek
Website: xu4- Ultima IV @ SourceForge
Andrew Taylor’s SDL-based re-creation of Ultima 4 is intended to be a cross-platform version of the game much as Exult is for Ultima 7.
xu4 is also compatible with the graphics update for Ultima 4.
The project fell dormant after 2008, but has since been restarted (as of January 2011) by Darren Janeczek, who went on to improve xu4’s gameplay experience, and restructured the code to facilitate the goal of porting the game to modern mobile platforms. And although those ports never emerged, the xu4 engine is overall much more stable and performant.