The Beryl XML GUI library was written to ease the development of graphical user interfaces using Swing on Java. It lets you store user interfaces as XML markup. This will help you avoid unnecessary clutter in your source; Swing code mixed with application logic can become a troublesome and hard-to-read mess as the application size increases. The library comes with a visual component builder, which makes development easy.
Clean Programming Language is a general purpose, state-of-the-art, pure and lazy functional programming language designed for making real-world applications. Its unique typing system makes it possible to incorporate destructive updates of arbitrary data structures (including arrays) in a pure functional language and to make direct interfaces to the outside imperative world.
DiaCanvas is a generalized version of the drawing canvas used by DIA. It extends some features used by DIA and adds new ones, while preserving as many of the original features as possible. This project is no longer actively maintained. It is suggested that you try DiaCanvas2 instead.
DogPerl is an offline Perl/Tk widget documentation resource. It includes an adjustable interface. Since it is a reference to detailed information about Tk widgets as they can be used in Perl, the program does not do much. It is an encyclopedia for Tk within Perl. However, font color, size, face, and style can be customized easily. Page background color, border size, and paragraph spacing are also customizable. The program illustrates the use of Perl/Tk.
FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit for UNIX/Linux (X11), Microsoft Windows, and Mac OS X. It provides modern GUI functionality without the 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, and also works fine as a shared library. It also includes an excellent UI builder called FLUID that can be used to create applications in minutes.