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Is there a good (preferably free) web application that allows you to draw ER and class diagrams like Microsoft's Visio?

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See also: webapps.stackexchange.com/questions/2157/… – Senseful Sep 14 '10 at 19:37
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8 Answers

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As I answered this for similar quesion you can use Gliffy

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I've just had a play with Gliffy, and whilst it's not a feature complete it's very easy to use! – Adam Pope Jul 2 '10 at 11:31
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up vote 1 down vote

While not strictly a web app, I believe ArgoUML has a Java Web Start option.

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LucidChart is a online Visio alternative where you can create ER diagrams, class diagrams, etc.

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You can create ER Diagrams with SmartDraw.

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Check out yUML it is 100% web-based, easy to use and produces nice UML diagrams!

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up vote 0 down vote

It's not a webapp, but since it's very good you might want to take a look at it.

I've just started using PlantUML and it's perfect. It's not exactly like Visio, but I find it's actually better.

Example:

alt text

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You should try http://creately.com - works well for all types of diagrams including UML and flowcharts

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Additional online tools with this features are Diagramly and Cacoo, both are somewhat better translated than the other online tools.

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