fltk2: FLTK 2 (The Fast Light Tool Kit) fltk2: fltk2: The Fast Light Tool Kit ("FLTK", pronounced "fulltick") is a fltk2: a cross-platform C++ GUI toolkit for UNIX(r)/Linux(r) (X11) fltk2: Microsoft(r) Windows(r), and MacOS(r) X. FLTK provides fltk2: modern GUI functionality without the bloat and supports 3D fltk2: graphics via OpenGL(r) and its built-in GLUT emulation. fltk2: fltk2: **FLTK 2 is parallel-installable with the old FLTK 1** fltk2: fltk2: