- moby : a Scheme compiler which allows Scheme programs to be run as "native" Android apps, or as javascript programs which run in a web browser.
- AppEngine : Google's "cloud" of computing infrastructure. WeScheme uses AppEngine to handle user accounts, serverside compilation, and file management
- ie7-js : Dean Edwards' excellent javascript library, which allows us to ignore many of the cross-browser issues associated with supporting IE6 and 7.
- ExCanvas : Google's javascript library that provides a Canvas implementation on browsers which do not support it (IE).
- Closure : Google's javascript compiler, library and template system.
- CodeMirror : Marijn Haverbeke's fantastic library for in-browser editing.
The source to WeScheme itself is
available> for download, under the GNU LGPL license.