Umlet

I recommend the Umlet diagram editor for creating UML diagrams. BUT Umlet uses a third-party advertising system that can make it difficult to safely navigate to a download. So:

• As of August 12, 2017, the current version of Umlet could be downloaded here.

• The main Umlet page is here, including documentation and a video. Just be careful - links entitled "Get it now!" and "Try Free!" are for third party products and are not part of Umlet.