A distributed data community. Dat is a nonprofit-backed community & open protocol for building apps of the future. Use Dat command line to share files with version control, back up data to servers, browse remote files on demand, and automate long-term data preservation.
While it may be trade free, this particular project states on its Github page that it is deprecated.
the dat protocol seems to be completely trade-free, you can just download it and share, backup, and publish your filesystem. It is supported by the dat foundation.