XDirectFB is a rootless X Server using DirectFB Windows for X11 toplevel windows. This way the opacity of every application can be adjusted with your mouse wheel. Window movements are initiated by the application or the window manager. The graphical movement is done by DirectFB using the available hardware acceleration. Overlapping toplevel windows does not cause expose events, i.e. redrawing of the window contents, as they are DirectFB windows and therefore have an own surface, or backing store.
DOMC is a lightweight implementation of the Document Object Model (DOM) in ANSI C as specified in the W3C DOM Core Level 1 recommendation. When coupled with the Expat XML Parser Toolkit, DOMC can load, store, build, and directly manipulate XML documents represented as a tree in memory.
freeglut is intended to be a 100% plug-compatible clone, and is released under the Xfree license. The GLUT (OpenGL Utility Toolkit) is a widely used library for doing window control, keyboard, and mouse input, and other basic functions for OpenGL programs. However, GLUT is not OpenSourced - although it's source code is available under a somewhat ill-defined set of restrictions. Hence, 'freeglut'.