Fast Light Plugin Toolkit (FLPTK) is a fork of FLTK2 with the goal of being more usable for application plugin GUIs that run independently of the GUI of the host.

It is experimental. Present, slowly ongoing work includes gradually combining the FLTK2-derived codebase with new developments from FLTK1.3, as well as continuing to work on FLPTK's main addition: Context separation, allowing several GUIs in a program running the same instance of the library to keep formerly global data and settings to themselves.