Embedded GUI

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.

http://www.cranksoftware.com/products/crank_storyboard_suite.php

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