Not only Cezanne looks great, it also allows you to combine the custom LAF with e.g. Nimbus:The WebStart Demo works perfectly on Mac. The real application looks actually better, than the screenshot above :-).
NEW workshop: Building HTML 5 Applications With Angular 2
Full week in December 2016: from Java EE 7 Bootstrap, Effective, Architectures over Testing to Microservices
On demand workshops: Java EE 7: Bootstrap, Effective, Testing and Microservices available for streaming.