Notable DNSCurve users
The cr.yp.to site and all subdomains, such as NaCl, TweetNaCl, SafeCurves, etc. are all protected with DNSCurve.
BuddyNS is an authoritative DNS provider that supports 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.
Arch Linux 32 is a community maintained continuation of 32-bit support for Arch Linux.