I heard about this engine while investigating techniques for speeding up my own raycaster, which also builds on SDL2. I found a post by the main developer describing how ECWolf works, and claiming that he intended it as a general-purpose engine for running old raycaster games on modern computers, not just a Wolfenstein port.
As soon as I read that, I knew exactly the game I'd like to see it support. Its world geometry is barely more complicated than Wolf3D's. The map is still a fixed grid, and all objects are still billboards, but now there are variable floor heights, transparent walls, and water with a cute animation effect to make the surface look like cartoonish waves. Strangely enough, it doesn't support stairs, instead using a crudely drawn door texture to represent the point of ascent or descent to the next floor of a building. The gameplay mechanics are quite different from Wolf3D, a little closer to their common parentage in Ultima Underworld. And while the series as a whole is so fondly regarded that the fans border on self-destructive obsession, it's only the sequels that are getting any kind of attention towards efforts at a remake.
Naturally I'm talking about The Elder Scrolls I: Arena.
Then again, there'd be so little reward for this kind of project...