Curated Lists of DNS Server Software

DNS | DNSSEC

https://www.statdns.com/resources/

Contains lists for DNS servers, libraries, tools, and other resources.

https://linuxmafia.com/kb/Network_Other/dns-servers.html

List of maintained and unmaintained DNS servers, including descriptions for each of them.

https://dnsinstitute.com/implementations/

Short overview over open source projects for authoritative and recursive servers and development libraries.