Unbound.

Open-source validating, recursive and caching DNS resolver by NLnet Labs

Facts

AdGuard DNS
DNS service by AdGuard (based in Cyprus) with ad and tracker blocking
CY · commercial
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AdGuard Home
Open-source DNS server for blocking ads and tracking at network level
CY · open-source
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Blocky
Lightweight open-source DNS proxy and blocker written in Go
DE · open-source
↗
dnscrypt-proxy
Open-source DNS proxy with support for encrypted DNS protocols
FR · open-source
↗
Mullvad DNS
Swedish privacy-friendlye DNS service by Mullvad VPN without logging
SE · commercial
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Quad9
Swiss non-profit DNS service with focus on security and privacy
CH · commercial
↗