Tendenci is completely free, and you can download and host the platform wherever you like.
Tendenci terms (as written on their website):
You could have a local developer set up a site for you if you wanted. The Tendenci platform can be downloaded at https://github.com/tendenci/tendenci– no gimmicks. You have the voluntary decision to move to your own server in the course of time – even if you decide to host with us – nothing can be taken away from you. Ever. We can even push backups to your own Amazon bucket every night. Again, that is the power of Open Source.