Style is the ongoing C++ port of IBM's SWT for Java, itself deriving from IBM's VisualAge for SmallTalk, with two major twists. First, it is written in 100% ISO-C++ with no specific compiler dependencies, and second, it comes with a threading model design that guarantee that users won't be stuck with busy cursors forever. It currently targets OS X, Win32, and GTK.
The Platonos Projects are a group of sub projects aimed to provide Java developers with a stand-alone plugin engine as well as a pluggable Swing application framework similar to other RCP (Rich Client Platforms) available. The goal is to have an out-of-the-box runnable Swing application with the more common pieces applications contain, such as preferences, help, file I/O choosers, configuration, and more all via plugins which can be left out if not needed. Building upon the shell is very easy by simply adding plugins that provide extended behavior for existing plugins, or adding new plugins that will then be extended by other plugins.
The goal of XPS is to make programming simpler by raising the level of abstraction without loss of performance. It provides true support for meta-programming and domain specific languages, making it possible to design simple programming languages to match the problem at hand. This is the opposite of current practice which seeks to translate the problem domain down into the low level solution domain of current programming languages.
LibGC is a small, fast, portable, multi-threaded garbage collection library for C++. It is highly customizable, as it can be multithreaded or single threaded, and the memory size to use for the collector may be changed at compile time. It is precise, as it only scans pointers that exist as members on the stack or as global variables. It's very easy to use, since it has only two classes, Object (the base class for garbage-collected objects) and Pointer (for garbage-collected pointers).
Standard GUI Framework for C is a framework for building GUI applications in ANSI/ISO standard C in a platform independent (i.e. portable) manner. The framework currently only targets X11, but there are plans to target both Microsoft Windows (Win32) and Apple Mac OS X (Carbon) after the initial release is done.