Wavemaker
Wavemaker is a RAD browser based development tool for creating Java/Javascript/Ajax applications.
Wavemaker is 100% open source. (Apache 2 license)
I am interested in it because I need to create applications backed by PostgreSQL databases.
Quickstart
Build database and import it
Start Wavemaker running as yourself not root. Intent is that you build on a staging server and deploy to cloud.
A project directory is created in your home directory.
Sample database
I will build my sample app on my motion database, which I use to keep track of bicycle and car things. It is part training log, part asset manager.
The basic tables are: trip rider photo vehicle maintenance
The junction tables are: j_trip j_photo
Wavemaker docs on relationships and foreign keys
Related products
Eclipse http://eclipse.org/
Spring http://springsource.com/