Public Instance Services
Tor
https://metrics.torproject.org/rs.html#search/darkheroes
Unfortunately, I can no longer maintain these instances.
Nitter
A free and open source alternative Twitter front-end focused on privacy and performance.
Clearnet: https://nitter.manasiwibi.com/Onion: http://li7snkj6oituazbkr5clmilccwwumhd2dntbhttxomy4dfakeeoar4qd.onion/
Teddit
A free and open source alternative Reddit front-end focused