G-Inspector, a tool visualizing internal data structures of Gtk+ application, and Grift, a library which enables separate description between core logic and the user interface in an application software.
Distributed Multiplatform Framework. Component based programming framework, using various repositories. The samples are implemented either in console or wxWidgets
port of the X Window System server to Windows. It shares the same source code base as Cygwin/X, but does not depend on the Cygwin environment or cygwin1.dll. Xming is a fully featured X11 server for Windows that is very simple to install and use.
a 2D graphics library, support for multiple output devices. (output targets include the X Window System, Win32, image buffers, PostScript, PDF, and SVG file output. Experimental backends OpenGL (through glitz), Quartz, and XCB.