Our users have written 1 comments and reviews about SequenceDiagram.org, and it has gotten 3 likes
Fantastic! It lets you draw by clicking in the diagram (drag to make sequences, right click to add boxes and other markup) and the 'code behind' is updated live, and vice versa! No more clicking to refresh but best of all: it's free. So far this is the only one with 'click and live draw' I found.