Quad9 is one of the few globally active public DNS resolver and is operated by a Swiss non-profit company. Quad9 operates DNS servers in more than 200 locations around the world and has a focus on data security, encryption and privacy.

Quad9 is currently involved in a legal dispute with Sony Music about whether websites that infringe copyright can be excluded from resolver. You can read more about the dispute on Wikipedia.

DNS0.EU is a non‑profit public resolver from France. The resolver supports modern DNS protocols like DNS‑over‑HTTPS, DNS‑over‑TLS, and DNS‑over‑HTTP/3. DNS0.EU does not log personally identifiable information.

The service is very focused on the European Union. The servers are only in the EU, and they operate at least one server per member state. The website is translated in all 24 official languages of the EU.

They also offer a special DNS resolver for kids, where content that is not childproof is blocked.

DNS.WATCH is a public DNS resolver from Germany with a focus on privacy (no logging) and security.

DNS.SB is a public DNS resolver from Germany with a focus on privacy (no logging) and security. The software is open source and they support DNSSEC, DNS over TLS and DNS over HTTPS.

The Swedish VPN company Mullvad offers a free public DNS resolver. It supports DNS over HTTPS and DNS over TLS. They also offer a resolver with ad protection and one without. The list of blocked domains for the DNS protection is maintained on GitHub.

UncensoredDNS is a public DNS resolver from Denmark. The support DNS over TLS and DNS over HTTPS.

The restena DNS resolver is a service of the Luxembourg Restena Foundation. The support DNS over TLS and DNS over HTTPS.

Digitalcourage is a non-profit organization from Germany that operates a public DNS resolver. The resolver is hosted in Germany and supports DNS-over-TLS. The site that explains the service is only available in German language.

The Swiss non-profit Digitale Gesellschaft operates a public DNS resolver that supports DNSSEC, DNS-over-TLS and DNS-over-HTTPS. The website explaining the service is only available in German.

The German non-profit Artikel10 e.V. is operating a public DNS resolver which supports DNS-over-HTTPS and DNS-over-TLS.