Open-source DNS clients
3 DNS clients whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.
DNScrypt-proxy 2 Grade B
DNS proxy supporting encrypted DNS protocols including DNSCrypt v2, DNS-over-HTTPS, Oblivious DoH and Anonymized DNSCrypt.
ISC. Source code
Stubby Grade B
Local DNS privacy stub resolver that encrypts DNS queries from a desktop or laptop to DNS-over-TLS resolvers.
BSD-3-Clause. Source code
Nebulo Grade D
Android DNS changer that sends queries over DNS-over-HTTPS or DNS-over-TLS without root, using Android's VPN interface by default.
GPL-3.0. Source code
Compare all 3 DNS clients, open source or not.