Notable DNSCurve users
BuddyNS is an authoritative DNS provider protected with DNSCurve.
IANIX has been 100% DNSCurve since 2012.
TinySSH runs DNSCurve nameservers and distributes code that benefits from DNSCurve. TinySSH can be run over TCP or CurveCP.
CURVEPROTECT protects DNS and other protocols with DNSCurve and CurveCP. It also supports DNSCurve on its own domain.