Seedlet
Seedlet is a source-code-embedded snap-on GUI for java applications.
Seedlet is an open-source source-code embedded snap-on GUI for standalone Java applications. It can be used for development and testing of independent classes, GUIs for command-line APIs or as independent applications.
In addition to a simple GUI, Seedlet provides lots of extras useful both for testing and for applications. It comes with a simple JSR-223 scripting framework, easy JDBC access, many GUI convenience method and other 'under-the-hood' functionality besides.