Don't waste your afternoon drawing UML Sequence Diagrams.
Just enter the description here, and click "draw". The SD/MSC Generator is an easy alternative
to using mouse-centric tools like Microsoft Visio.
"Diagramly is a free online diagram drawing application. You can use it to create UML, entity relationship, org charts, BPMN and BPM , database schema and networks. Also possible are telecommunication network, workflow, flowcharts, maps overlays and GIS, electronic circuit and social network diagrams. It's like a mini version of Visio in your browser.
You can export your diagram in our raw XML format, PNG or JPG, or as SVG. When reloading you can load back up the XML you saved previously, or import Visio. vdx.
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Creately - Online Diagramming and Design is a joy to use. Its designed for ease of use and collaboration. It takes 'easy' to a whole new level by intelligently adapting to the kind of diagram you are drawing. Creately has been designed so you can draw just about anything, fast and easy.