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I am looking for a cross platform diagramming tool like Viso I can use on Windows, Linux, and OS-X for diagramming. Are there any decent ones available?

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Diagramming what exactly, that would probably help with getting a clear answer? – Richard Nov 29 '10 at 11:56
Thanks, I have amended the question – Zubair Nov 29 '10 at 18:38
up vote 5 down vote accepted general as the question is: a GTK+ based diagram creation program for GNU/Linux, Unix and Windows released under the GPL license.

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I think Dia is the worst application ever made, but there are such few alternatives... – cYrus Nov 29 '10 at 20:49

Google Docs now includes a flowchart and diagram creation tool. It's a cross-platform, web-based app. It's not what I'd call full-featured, but it can get the job done in a pinch. It's free and also allows for some team collaboration, with everyone drawing and viewing the same diagram simultaneously.

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The old warhorse of Open Office has a Visio equivalent

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