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A comment on Push API – W3C Working Draft. Parent comment
You could also try yED. http://www.yworks.com/en/products/yfiles/yed/
EDIT: This site has a nice list of a bunch of software that you can check. http://alternativeto.net/software/dia/
You could also try yED. http://www.yworks.com/en/products/yfiles/yed/
EDIT: This site has a nice list of a bunch of software that you can check. http://alternativeto.net/software/dia/