The enderchest will have the same content for each players to make it more useful, so it can be used for donation, trading or just simply share items between players.
download ( alternative dropbox link )
Note: Players won't be able to see the original content of their enderchest while the plugin installed/enabled, but it won't lost, so you can disable the plugin the acces it.
Credits: Thanks for aadnk for the inventory serializator https://gist.github.com/aadnk/8138186