The following third-party libraries/code are provided:

- Mocha (http://mochajs.org/)
- Chai (http://chaijs.com/)
- Sinon (http://sinonjs.org/)
- Sinon-Chai (https://github.com/domenic/sinon-chai)
- Underscore (http://underscorejs.org/)
- AffineTransform from Google Closure (http://docs.closure-library.googlecode.com/git/class_goog_graphics_AffineTransform.html)

See the websites for their respective licenses.