Mac users interested in Astah community 6.3 generally download:
Astah Community is an add-on tool for your UML that is ready to use the instant you download it, allowing your UML to be quickly and easily enhanced, and refining your development process with Astah's innovative modeling approach.
Instantly suggest features to models.
Automatically aligns actors, UseCase, and Classes
Additional suggestions for Astah community 6.3 by our robot: