Yes GLXTreem does support 2D. (Look at the imagelist demo for full 2D example).

GLXTreem is effectivly the same set of components as DelphiX but for OpenGL. It then adds some more.

The only thing GLXTreem doesn't support that DelphiX did is the use of direct Canvas access. But as Direct Canvas access was bad anyway it is probably a good thing

There are now 2 Games on my web site that are 2D and created using GLXTreem. (Slide Puzzle and Finding Friends ver 2)