Creately is a online visio like diagramming tool with real-time collaboration enabled. There are stand alone versions available for Windows/Mac and Linux. Flowcharts, Org charts, venn diagrams, infographics , etc can be drawn from Cerately. Creately offers 1000 of templates to start drawing immediately. It is simply the best diagramming tool available online.
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Pro Real Time Collaboration
You can invite anyone by their email addresses to collaborate with your diagram. You can see others changes to the diagram real time with Createlt Online and Desktop app.
Pro SVG Import & Export
Creately supports SVG (Scalar Vector Graphics) import and export to make your diagrams more attractive. It allows you to re-size your diagram as much as you want without getting it messed up