ref: forum item "Anyone actively working on FreeMind?" (https://portableapps.com/node/22921)
& other FreeMind related threads from over the years
-- How about getting Freeplane into apps available for download from PApps website ("Portable App Directory" listing)?
-- A development fork from FreeMind is FreePlane (http://freeplane.sourceforge.net) which looks like a solid Mind Mapping application that already has a portable version available which is supposed to function with the Portable Apps launcher. I've had some issues with getting the portable version working with the PApps launcher -- related to need for JRE needed to be installed on the supporting OS (similar issue as with FreeMind).
-- I've tried it out a bit for evaluation & found it a solid & stable application that carries the Free Mind look & feel forward. While I'm still evaluating FreePlane for usability, I'm ready to abandon FreeMind and migrate to FreePlane.
With regular install on supporting OS, FreePlane functions O.K. on Mac OS X & MS XP. Still trying to get it work on Linux -- only FreeMind v 0.8.x installed there & haven't found "deb" package to install in Ubuntu. (Gave up finger poking things in many years ago - let the GUI handle it. I could cut my lawn with a manicure scissors too, but got too lazy using a lawn mower.) Once I get it functional in Linux, I can bid FreeMind farewell.
-- I've found it fairly interoperable with Free Mind v 0.9.0 rc 6 or rc 7 in using the same .mm files; however, there are some issues. Hyperlinks & multi-line nodes end up differently formatted when using copy/paste between applications. Also FreeMind & FreePlane use different methods of remembering map displays of open files when shut down.
-- FreeMind v 0.8.x will work with text files edited by FreePlane (i.e. no special text formatting) but becomes intolerably slow in opening them.
Found work around for interoperability with Freemind v 0.8.x: On system where Freeplane is used, also install Freemind v 0.9.0 v 6 (or v 7). After last mind map file edit with Freeplane, open the file with Freemind (v 0.9.0). All nodes will be open (forcing display of entire, unfolded mind map). Highlight central map node (click on node), then close all using minus sign icon on top bar to collapse all nodes beyond first order from central node. Then, when opened using Freemind v 0.8.x on other system, only closed map will display initially. That eliminated intolerable delay in opening the file. Freeplane should have no issues with opening mind map files edited by Freemind v 0.8.x