Low-level widget toolkits:
A cross-plataform, easy-to-use, non-intrusive C++ GUI library that runs on top of SDL. [Open source, LGPL]
A rich thin client framework for building software applications that combine the usability and speed of desktop software GUI with the centralized administration and universal accessibility of Web apps.
API toolkit for developing GUIs with LCD driver library graphics and graphical display controller drivers. Graphic LCD module application using advanced features like proportional writing, icons, lists and scroll boxes, line drawing.
A cross-platform C++ based Toolkit for developing GUIs easily and effectively (Unix/X,Win32). [Open source, LGPL]
An attempt to provide an Object-Oriented application development framework and tool set for use on a wide variety of computer platforms. Based on the original OpenStep specification provided by NeXT, Inc.
Toolkit for cross-platform GUI programming on Windows, X-Windows, Linux and Macintosh systems. It works with the C, C++ and Python languages, and the source code can be freely downloaded here.
The PEG GUI library home page. PEG is a C++ GUI library designed exclusively for real time embedded systems.
Imake FAQ, software accompanying the O'Reilly "Software Portability with imake" book, notes on use with Motif and X11, imake-related utilities source code.
JX is a full-featured C++ application framework and GUI class library for the X Window System.
A Lightweight, cross-platform GUI library and application framework. Currently 3 ports exist, Win32, Linux and BeOS. [Open source]
A C++ based core library for GUIs. Uses OpenGL as drawing library and SDL/Glut as windowing toolkit. [Open source, LGPL]
Based on the Simple DirectMedia Layer (SDL). Allows to put together portable graphical applications.
A free bubble or balloon help X Widget.
By ProtoDesign, Inc. Develop and deploy highly interactive scientific and engineering simulation programs without writing one line of graphical user interface (GUI) code.
A GUI framework for use in interactive OpenGL applications. The main goal is to provide very easy and fast way to develop portable interactive interfaces, using object-oriented approach. [Open source, BSD License]
A light weighted GUI C++ library for developing GUI applications in Windows API.
An open source project aimed at making UI coding easier. The C++ library introduces rules-based UI coding, reflections and several other mechanisms to speed up UI coding.
C++ framework created to provide platform GUI framework, features such as Java and Java's Swing, and Borland's Visual Component Library. [Open source, BSD License]
Patches to provide TrueType font support for X11.
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