Software that uses FLTK

Dillo is a minimalistic web browser particularly intended for older or slower computers and embedded systems. It supports only plain HTML/XHTML (with CSS rendering) and images over HTTP and HTTPS; scripting is ignored entirely. Current versions of Dillo can run on Linux, BSD, macOS, IRIX and Cygwin. Due to its small size, it is a popular choice for lightweight Linux distributions. Dillo is free software, released under the GNU GPL-3.0-or-later.

2010 video game

software

Gmsh is a finite-element mesh generator developed by Christophe Geuzaine and Jean-François Remacle. Released under the GNU General Public License, Gmsh is free software.

ZynAddSubFX (also now called Zyn-Fusion) is a free and open-source software synthesizer for Linux, Mac OS X and Microsoft Windows. Version 3's new user interface was initially released under proprietary terms, but is now open source (though prebuilt binaries are still sold to fund development).

thumb|FLWM 1.02 Xsession running on Debian 7 [[Linux]]