fltk - the fast light tool kit
The Fast Light Tool Kit ("FLTK", pronounced "fulltick") is a C++
graphical user interface toolkit for the X Window System, MacOS(r), and
Microsoft Windows(r) that supports OpenGL(r). It was originally
developed by Mr. Bill Spitzak and is currently maintained by a small
group of developers across the world with a central repository in the
FLTK is provides under the terms of the GNU Library General Public
License, with the following exceptions:
1. Modifications to the FLTK configure script, config header
file, and makefiles by themselves to support a specific platform
do not constitute a modified or derivative work.
The authors do request that such modifications be contributed to
the FLTK project - send all contributions to
2. Widgets that are subclassed from FLTK widgets do not
constitute a derivative work.
3. Static linking of applications and widgets to the FLTK
library does not constitute a derivative work and does not
require the author to provide source code for the application or
widget, use the shared FLTK libraries, or link their
applications or widgets against a user-supplied version of FLTK.
If you link the application or widget to a modified version of
FLTK, then the changes to FLTK must be provided under the terms
of the LGPL in sections 1, 2, and 4.
4. You do not have to provide a copy of the FLTK license with
programs that are linked to the FLTK library, nor do you have to
identify the FLTK license in your program or documentation as
required by section 6 of the LGPL.
However, programs must still identify their use of FLTK. The
following example statement can be included in user
documentation to satisfy this requirement:
[program/widget] is based in part on the work of the FLTK
FLTK Programming Manual
FLTK Web Site, http://www.fltk.org/
Bill Spitzak and others.