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.
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.
Vis/Space is a client-server system for visually exploring data structures in 3D virtual space. It allows the placement of various data sources in a three-dimensional environment. Custom search terms can be entered into a query field, or can be navigated to and from an existing object. All objects like images and "text screens" can be moved around. A single click on an image shows the full-resolution version in the foreground. Whole collections of images can be moved. A click to the cube also toggles among several different possible layouts. Data sources include search engines, microblogging, Wikipedia, image/video search, and 4chan.