If you are looking for and embedded GUI for Linux then Crank Software's Storyboard Suite is worth your time to take a look at. It supports fbdev, directfb, and SDL and doesn't require an X server. Also has support for OpenVG and OpenGL ES.
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Key features include :
- WYSIWYG development environment
- Animation support is built in
- Desktop Simulator
- LUA script engine and debugger
- Designed for embedded systems - event driven - image and font cache limits - support for hardware accel including using hw layers - native API for communication with external applications
- Built on eclipse and supports Linux hosted
- Supports direct import from Photoshop
- Plugin architecture to allow scalability