Christoph Rissner describes in his article () at IICM site () his implementation () of data exchange between FreeMind and MindManager.
If you have a lot of maps created by FreeMind and you want to switch to another program, writing a conversion program should be easy, especially if that program features Visual Basic scripting facility.
#Freemind vertical tree software
A free version of ClickCharts Diagram & Flowchart Software is available for non-commercial use. Download ClickCharts Diagram & Flowchart Software for Windows. Fully functional following of HTML links stored in the nodes, be it www links or links to local files. This makes our flow chart software an ideal method to visualize your data, troubleshoot and optimize processes, and share information.