It's a few years old now and not the most intuitive program but has a remarkable number of features. Still I'm kind of pleased that it's one of 5 mindmap programs I've tested recently that isn't a massive download that turns out to be registerware.
Requirements: WinXP and above, NET Framework 4.0
Status: Not portable
License: GPL
http://instrumind.com/
https://www.softpedia.com/get/Others/Fi ... oser.shtml