AnyMap is a flexible Flash-based solution for easily displaying any sort of data dealing with geographical locations. It contains maps of the US, the world, and US counties. It is driven by an XML interface and is easily implemented. There is no need for ActiveX on the server. Graphics are rendered on the client. All scripting languages (including ASP, PHP, ColdFusion, and Perl) are supported. You can easily add your own custom images and texts.
pulseaudio-mixer-cli is an interactive ncurses UI to control the volume of PulseAudio streams. It is somewhat like alsamixer, but focused not on sink volume levels (which can actually be controlled via alsamixer, with the alsa-pulse plugin), but rather on the volume of individual streams from applications, allowing the user to balance sound levels between them. Interaction with pulseaudio is done through the DBus interface, and the UI is designed to be as simple as possible, without heavy DE dependencies like GNOME libs or KDE/QT.
FreeForth is a small and fast interactive compiler composed of an extensible set of macros generating inline compact i386 native code, including floating-point instructions, and an easy interface to Linux and Windows dynamic libraries. It uses two stacks to pass subroutines arguments and results separately from return addresses, like other Forth dialects, but unlike them, it is a simpler pure compiler (without an interpreter) offering interactivity through "anonymous" subroutines which are executed by their closing ";" macro. FreeForth is fully documented by 100K of interactive online help. Since its first release in 2006, it has been used every day for cross-development of realtime industrial applications embedded in microcontrollers, and for PC-controlled manufacturing test benches. The FreeForth distribution includes an interactive incremental assembler for the MSP430 microcontroller family.
Swallowapps provides interactive tools for the design of Web (HTML5) content. You create the visual part of your application using visual tools and get instant feedback while you adjust dimensions, transformation matrices, colors, shadows, gradients, and other styling elements in an intuitive and interactive way. When the time comes for programming, Swallowapps combines the convenience of the commonJS packaging specification (the require() function, package.json, etc.) with an automatic build process. Modify any source module of any package which you use, hit F5 in the browser, and your updated application is reloaded. Swallowapps tools are built with themselves, so as you learn how to use the tools, you also learn how to modify them and make them tightly fit your specific needs.