I'd like to personally thank Dmitri Bouniol and Ben Carlsson for coming up with a way for self-compiled builds to bypass the license check. Without them, it would be impossible to have a free ...

The Fast Light Tool Kit (FLTK) is a cross-platform C++ GUI toolkit for UNIX®/Linux® (X11 or Wayland), Microsoft® Windows®, and macOS®. FLTK provides modern GUI functionality without bloat and supports ...