JX is a full-featured C++ application framework and GUI class library for the X Window...
Here are the static libraries and header files for the support library for the GIMP's X...
FOX is a C++-based toolkit that was designed for developing graphical user interfaces...
FLTK is a C++ GUI toolkit for X and Windows. FLTK provides a complete set of GUI widgets,...
EZWGL, the EZ Widget and Graphics Library, is a GUI and graphics library for X11.
DLDialog is a Tk-like toolkit that offers the ability to draw to a number of widgets.
BLT provides extra widgets and commands for tk programs.
Ikaros is a framework for writing and running component-based simulators.