Simple Sketch UML & Notes application. When just words are not enough.
Sketchboard.Me is a new online digital sketchboard where users together design and share ideas, in real time. It strives the way software diagramming is meant to be, for communication. Emphasis is on software diagramming, mind mapping and notes. Use it for UML, Scrum retrospective, as Kanban board or just writing and sharing ideas.
Also Confluence Plulgin available.