The Fast, Light Toolkit is a cross-platform graphical user interface library developed by Bill Spitzak and others. Made to accommodate 3D graphics programming, it has an interface to OpenGL, but it is also suitable for general GUI programming. Using its own widget, drawing and event systems abstracted from the underlying system-dependent code, it allows for writing programs which look the same on all supported operating systems. FLTK is free software, licensed under LGPL with an additional clause permitting static linking from applications with incompatible licenses. It includes FLUID, a graphical GUI designer that generates C++ source and header files. In contrast to libraries like Qt and wxWidgets, FLTK uses a more lightweight design and restricts itself to GUI functionality. Because of this, the library is very small, and is usually statically linked. It also avoids complicated macros and separate code preprocessors, and does not use the following advanced C++ features: templates, exceptions, RTTI or, for FLTK 1.x, namespaces. Combined with the modest size of the package, this leads to a relatively short learning curve for new users. Wikipedia [ - ]

The Fast, Light Toolkit is a cross-platform graphical user interface library developed by Bill... [ + ]