FLTK
From OSSWiki
FLTK ("Fast Light Toolkit"), pronounced "fulltick", is a cross-platform, free software, GUI library. It is written in C++ and is functional on Windows, GNU/Linux, Mac OS X, Solaris, OS/2, and other Unix and Unix-like operating systems. It includes a UI builder called FLUID that can be used to create applications in a short amount of time.
FLTK provides GUI functionality without bloat and supports 3D graphics via OpenGL® and its built-in GLUT emulation. FLTK is designed to be small and modular enough to be statically linked - the "hello, world" program binary is only 97 kilobytes when compiled on an x86 Linux system. FLTK can also be used as a shared library, which is now being included on some Linux distributions.
FLTK has Python bindings available via PyFLTK, as well as a utility to convert FLUID files into Python code.
FLTK is distributed under the terms of the GNU Lesser General Public License, Version 2 with exceptions that allow for static linking. The exceptions allow others to, either statically or dynamically, link its libraries into proprietary / closed-source programs. This means it is free software / open source software but it is not copyleft.
The Dillo web browser is currently being ported to FLTK.
Branches
FLTK 1.1.x is the current stable release branch. FLTK 2.0 is currently in development and available via CVS. Snapshots of 2.0.x are usually providing backports to and released in pair with 1.1.x. Please see the software page for details.
FLTK 2.0 provides enhanced device, rendering, and style interfaces to support more platforms, printing, and application "skins".
