Protovis/GWT uses the following software components and resources developed 
by various people and organizations:

Google Web Toolkit (GWT)
Web application framework
Version: 2.1.1
URL: http://code.google.com/webtoolkit/
License: Apache License 2.0


Protovis
JavaScript Visualization Library
Version: 3.2
URL: http://vis.stanford.edu/protovis/
License: BSD License