Originally Pack And Go by Volker Börchers - no longer maintained
Pack and Go-Go adds a menu item to create a ZIP file with the mindmap, packing also its images and linked mindmaps (without dependencies).
Note: All files are loaded into RAM. If you get an Out Of Memory Error, see https://docs.freeplane.org/attic/old-mediawiki-content/Troubleshooting.html#freeplane-throws-out-of-memory-exception
Works with Freeplane version 1.9.1 and above.