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The Fast Light Tool Kit ("FLTK", pronounced "fulltick") is a C++ graphical user interface toolkit. FLTK also includes FLUID, the Fast Light User Interface Designer, which allows you to graphically design applications, widgets, or classes for your GUI. The program was designed to be small and modular enough to be statically linked. It also works well as a shared library. 'fltk' does not use macros, templates, multiple inheritance, or exceptions. It is written directly atop Xlib for maximum speed.


Programmer's manual available in HTML format from; and in PDF format from

Related Projects


LicenseVerified byVerified onNotes
LGPLv2Genium15 September 2015
exceptions listed in COPYING file

Leaders and contributors

Gustavo Hime Contributor
Matthias Melcher Contributor
Bill Spitzak Maintainer
Michael Sweet Contributor
Carl Thompson Contributor
Vincent Penne Contributor
Craig P. Earls Contributor
Curtis Edwards Contributor

Resources and communication

Audience Resource type URI
Developer,Support E-mail
Bug Tracking VCS Repository Webview
Developer VCS Repository Webview
User Download

Software prerequisites

This entry (in part or in whole) was last reviewed on 15 September 2015.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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