Knot Resolver: Resolve DNS names like it's 2021! https://www.knot-resolver.cz/support/

High-performance authoritative DNS server. Please support the development https://donations.nic.cz/donate/?project=knot-dns

A blockchain-based DNS + HTTP server that fixes HTTPS security, and more!

Zerigo DNS Ruby Gem

Check your DNS against over 1500 global DNS servers

Asynchronous DNS component for Icicle.