Hi,
What are the GUI tools available for JPA?
Maybe you should be more specific in what you are searching for: code generation, visual configuration of entities / relationships between entities, visual query creation, etc.
Both Netbeans and Eclipse (with myeclipseide) have some support for JPA entity generation and relationship management.
Netbeans includes that feature built-in. It can create your Entity Beans right from some DB Schema. For eclipse you might check out Dali.
I believe MyEclipse has some tools available for JPA.
I've personally used some of their persistence tools and have only found them useful for simple tasks. MyEclipse is a good all-around IDE though.