no invite needed:

aangat.lahat.computer

autistici.org– you have to explain why you want an account

disroot.org(tor browser only: link) – signup usually available on weekdays

espiv.net(english here) (tor: link) – you have to explain why you want an account

systemausfall.org(english here) – if you don't have a vouch (explained below), you have to share something online that shows your politics

(a vouch is basically confirmation that you're 'legit' from someone who's already accepted)

invite or vouch needed:

riseup.net(tor: link) – you need an invite to join

aktivix.org– you need a vouch or mutual friends/compas to join

The Tor Project | Privacy & Freedom Online

Defend yourself against tracking and surveillance. Circumvent censorship.

^{www.torproject.org}