Linux
To run freeplane in Linux (like Ubuntu), there are 2 good options. Before that, it is recommended that you create a folder called "Programs" or something where you can save java applications like Freeplane, Freemind, Cron-o-meter, etc. You should also rename the unzipped applicaiton folder that you place there to just "freeplane", so you don't have to fix the directory paths in your launcher when you update the program version in the future.
1. command line (terminal): open a terminal and change directory to the place where you put your unzipped Freeplane folder, for example:
cd '/home/YOURUSERNAME/Programs/freeplane'
then, run the freeplane.sh:
sh 'freeplane.sh'
2. instead, you can make a nice little entry in your applications menu with the icon, which basically automates the above actions. This way is nice, because then you can launch it easily with GNOME Do or similar app launchers. To do this in Ubuntu (the process is similar in other distros: search for 'create launcher application' on google or something if you need to):
Open System>Preferences>Main Menu. In the options, navigate to the submenu location where you'd like it to go, such as "Office". Then click New Item, and create its launcher like so: To the left, click on the icon, and browse to the icon file freeplane.svg in its folder. For name, put Freeplane, obviously. Then for command, enter this:
sh -c "cd '/home/YOURUSERNAME/Programs/freeplane' && sh 'freeplane.sh'"