ZeroNet is programmed in Python and licensed under GPLv2 (no "or later").
Doesn't appear to depend on any non-free software at first glance. Manual
installation instructions for
Trisquel 7 are here:
https://miguelmenendez.pro/en/articles/install-use-zeronet-trisquel-belenos.html
and for Debian here:
https://zeronet.readthedocs.io/en/latest/using_zeronet/installing/
Would be keen to hear reviews and impressions for anyone who's used it, and
if it's any good, would be good to have it in Trisquel repos.