FLTK is also used in some moderately well-known FOSS apps, such as the recently-revived Dillo lightweight web browser and the FLWM window manager, as seen in the ultralightweight Tiny Core Linux.

Fltk (pronounced full tick) shares many features with FOX. It’s a C++ toolkit, built for Digital Domain’s Unix projects. It’s fast, and relatively small and light: ...

FLTK, the Window Toolkit of NUKE “FLTK was created for NUKE”, says D2 Senior Software Developer Bill Spitzak who created FLTK at D2 and got permission to make it open source. FLTK (the Fast Light ...