Portable Apps for teachers (Moodle, Nextcloud, OpenBoard)
Many OpenSource applications are actually portable. You just need to copy their installation to your USB key and take care to SUBST you USB drive letter to some fixed letter e.g. Z:/ before launching the Portable Apps shell. If some trouble remains most of the time you can cope with them adding the USB key the missing dlls and launching the app thru a .bat command file that takes care to assign the DOS variables TMP HOME PATH etc to some folder under Z:/