LucidChart is an amazing tool that is being added to our Google Apps. It can create MindMaps, Diagrams, FlowCharts, and can be shared like any other Google Doc. I’ve tested this one and it is very easy to use. It is also very robust in that it will allow merging of charts, as well as layers. It is a very simple tool and can be used to create interactive workspaces for students. I highly recommend this LucidChart for students.