WorldWide Telescope

The WorldWide Telescope (WWT) is a Web 2.0 visualization software environment that enables your computer to function as a virtual telescope—bringing together imagery from the best ground and space-based telescopes in the world for a seamless exploration of the universe.

Processing

Processing is an open source programming language and environment for people who want to program images, animation, and interactions. It is used by students, artists, designers, researchers, and hobbyists for learning, prototyping, and production. It is created to teach fundamentals of computer programming within a visual context and to serve as a software sketchbook and professional production tool. Processing is developed by artists and designers as an alternative to proprietary software tools in the same domain.

There's also a Javascript version of the code.

OpenVisuals

OpenVisual is a visualization that is created using Processing and OpenVisuals API, which makes it possible to use with any datasets on this website. Visualization artists can use these datasets to build a visualization. Once they upload the visualization to this website, it can also be used to visualize any other dataset on this website through OpenVisuals API.