We run a public non-logging DNS server with advertising and tracker filtering. The Usable Privacy DNS (updns) service is accessible via DoH and DoT to protect your DNS privacy. Filterlists are based on AdAway and Peter Lowe's list.
We do not log client IPs, requested domains or any other personally-identifiable information.
We aggregate information on filtered domains and geolocation for user protection.
The updns software stack is available under the BSD 2-Clause License on Github: