dnscrypt-proxy 2 - A flexible DNS proxy, with support for encrypted DNS protocols. - jedisct1/dnscrypt-proxy
acme-dns - Limited DNS server with RESTful HTTP API to handle ACME DNS challenges easily and securely.
The nsnotifyd daemon monitors a set of DNS zones and runs a command when any of them change. It listens for DNS NOTIFY messages so it can respond to changes promptly. It also uses each zone's SOA refresh and retry parameters to poll for updates if nsnotifyd does not receive NOTIFY messages more frequently.
Quad9 is a free security solution that uses DNS to protect your system against the most common cyber threats. It improves
your system's performance, plus, it preserves and protects your privacy. It's like an immunization for your computer.
DNSSEC test tool that provides advanced DNSSEC debugging.
PoisonTap - siphons cookies, exposes internal router & installs web backdoor on locked computers
DNS service discovery for the cloud, and (much) more!
ddnsadmin - Web interface for DNS zone management using TSIG keys
The Knot DNS Resolver is a caching full resolver implementation, including both a resolver library and a daemon.
Extensive web interface to dig