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)