Portable Freeplane
Freeplane can run as a portable application from your USB stick.
Windows
#Download a portable apps platform and install it on your USB stick, #run the platform software from the stick, #Download a portable java, #Download FreeplanePortable_XX.paf.exe, #Install portable java and freeplane as explained here
Now you can start Freeplane from the portable app platform program menu and it should use the java runtime from the stick.