JGraph is a free, mature, and robust Java diagramming library. It contains all the graph visualization, layout, and interaction functionality you might expect in a graph library, including multiple views, layering, zoom, drag and drop, undo, automatic expanding and collapsing, routing, and layouts. You can create workflow editors, BPMN, CAD tools, network diagrams, database visualization tools, and more. It is fully documented, including examples, and has an active support community.
reacTIVision is a computer vision framework for the fast and robust tracking of fiducial markers attached to physical objects, as well as for multi-touch finger tracking. It was mainly designed as a toolkit for the rapid development of table-based tangible user interfaces and interactive multi-touch surfaces such as the reacTable. Client application examples are available for various programming environments such as C++, Java, C#, Processing, PureData, Max/MSP, and Quartz Composer.
Flightdeck-UI is a project that utilizes the ideas in the design of aircraft controls and instruments for creating general purpose user interfaces. The project includes Flightdeck-UI Online (a Web-based monitoring system that works entirely through the browser), the Multi-Variable Monitor (MVM) application, and a Tkinter widget library. Flightdeck-UI Online is installed on a Web server. The MVM application provides a graphical editor with theme support for quickly creating Flightdeck-UI control panels. It is possible but not necessary to write code in order to use MVM.
FrAid (Fr[actal] Aid) is a programming language that is appropriate for mathematical computations, visualization, batch processing, and more. It features both a standalone application that provides a programming environment for the language and a system for integrating the language with Java. The Java interface allows mathematical equations and formulas to be used with Java code, making it easier to process numerical computations, symbolic computations, imaging, CAD, and more.
The QConsole class is a custom widget that implements a basic console, written in C++ and relying on Qt. It implements several features and is intended to be inherited from in order to have a "real" console for a specific scripting language, shell, etc. Example implementations for TCL and Python are included.