Graphic Subsystems

The Y Window System
Project writing successor of X Window System. The Y design has the following features: Network Transparency, Modularity (plug-in style: dynamically unloadable and reloadable), In-server implementation of widgets, Consistency and Themeability, Support for hardware acceleration, Better internationalisation, localisation, and accessiblity. [Open source, GPL]
http://www.y-windows.org/