I would like to see Treeline http://www.treeline.bellz.org/ added to the PortableApps collection. It has much more functionality than other outliners (such as CherryTree - which is also great) as fields in the nodes can be set up to allow it to function as a portable database. It can run portably already and is open source, but it would be good to have it packaged as a PAF so it can be integrated into the portableapps menu.
Dunno if you know but
https://portableapps.com/apps/utilities/convertall_portable
is by the same author.
Might be worth checking with the author (licence looks to be free) or (if different) the person that made it a PA.
Wm