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I am looking for a free online concept mapping app similar to MindMup but without the restrictions that come with mind mapping, eg:

  • Tree heirarchy with a central node.
  • No labelled and linked edges
  • No nested sub-graphs
  • Undirected edges
  • Cannot import/Export standard graph file formats (graphml, gml)

Basically looking for a web version of yEd or VUE (Visual Understanding Environment)

Any suggestions?

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closed as off-topic by Jacob Jan Tuinstra, Al E., Alex, ChrisF Oct 10 '13 at 12:26

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Just found popplet is non-heirarchical, but does not meet the other criteria. –  MachuPichu Sep 26 '13 at 1:30