FLTK

• http://fltk.org - Fast Light ToolKit

• License: LGPL

• Pronounce it “fulltick”

• Cross-platform (Unix X11, Windows and MacOS X) C++ GUI toolkit

• Modern but without the bloat. Supports 3D graphics (OpenGL).

• Applications can be prototyped in minutes with the FLUID builder

• Many applications and examples: http://www.fltk.org/links.php?LC+P22+Q