Comment on QuickShareIt

Yes, that's true... Pando does not work with Linux.
But I think you won't have to register to use it. At least I don't remember to have registered in Pando's website. (Please correct me if I'm wrong.)
When you send a package through Pando for the first time, the application asks only for a valid e-mail address, so that you may receive a confirmation that the package has been sent. (Which is useful for you to track what you have sent.)