The Google GWT WG site contains a comprehensive list of resources. See http://confluence.sakaiproject.org/confluence/display/GWT/Home
Here is a list of the tools / technologies used.
- http://gears.google.com/
- http://code.google.com/webtoolkit/
- http://www.gwt-ext.com/demo/ (good example)
- http://groups.google.com/group/gwt-ext
- http://www.sqlite.org/
Psybergate homepage : http://psybergate.com