Actually, although I've only used the input/2d side of the SDL, it didnt' really seem to support much in the way of 3D except in setting up OpenGL.
I think any commerical game that used the SDL would only use it for input/2d parts (menus, etc.) and then the 3D part would be any implimentation of OpenGL. I think the really hard part, though, would be in getting the source for those Linux games ;-)
Loki doesn't operate any more do they? Who is porting what to Linux these days? Linux is my only OS on my PC, but I'm way out of the loop when it comes to games

- Paul