libTISCH is a framework for easy development of multi-touch applications. It contains tools for video processing, calibration, gesture recognition and, most importantly, a GUI toolkit with widgets that utilize the multi-touch gestures detected by the lower layers. It runs on Linux, Mac OS X, and Windows.
Thyrd is an experimental, reflective, visual programming language and environment. In Thyrd, both data and code are stored in cells situated in nested two-dimensional grids. All operations the user can perform to edit the structure are implemented as operators in the Thyrd language, thus a Thyrd program can inspect and modify itself or other programs in the same space. Thyrd belongs to the Forth family of languages. It most resembles Joy in that it uses quotation and combinators to implement iteration and recursion.
TinkerBell is a application development tool for Ruby Web Dialogs. It can be used to develop GUI and Ruby code and a complete application. It works under rwdtinker, the core application for the rwdapplications. Rwdtinker can install and delete installed applets. This program uses the RubyWebDialogs GUI interface, and can be added to with drop-in applets. There are about 14 applets that can be installed. Context-sensitive help is on the windows and tabs.
PylotLight is a cross-platform, themeable, plugin-supporting system for general computing tasks. It is comparable to QuickSilver, which you may recognize if you use a Mac. Current plugins exist for Web searches, Firefox bookmark launching, filesystem browsing and managing, subversion control, terminal control, and more.
QtAda is an Ada2005 language binding to the Qt libraries and a set of useful tools. It allows you to easily create powerful cross-platform graphical user interfaces completely on Ada 2005. QtAda applications use the native look and feel on every supported platform. It also allows you to develop your own widgets and integrate them into the Qt Designer for high speed visual GUI development. It uses a native thread-safe signal/slot mechanism and provides full transparent integration with Ada tasks.
The Ecere SDK is a cross-platform toolkit for building software applications. It currently runs on Windows, Linux, Mac OS X (through X11), FreeBSD, and the Android OS. It should run on other Unix platforms with minor testing/tweaking. With the Ecere SDK, you can develop applications once and deploy them on all supported platforms alongside a lightweight runtime environment. It introduces eC, an object oriented language derived from and fully compatible with C, compromising neither runtime performance nor ease of use. A built-in 3D engine supporting both Direct3D and OpenGL is fully integrated.