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Online Diagram Software – Gliffy
“With Gliffy online diagram software, you can easily create professional-quality flowcharts, diagrams, floor plans, technical drawings, and more.”
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Cacoo – Create diagrams online Real time collaboration
“Cacoo is a user friendly online drawing tool that allows you to create a variety of diagrams such as site maps, wire frames, UML and network charts. Cacoo can be used free of charge.”
Posted from Diigo. The rest of my favorite links are here.