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http://unbound.net/ Here is another lesser known but actively developed DNS server.

The cool thing is that you can hook into the resolving chain with C and/or python.

unbound is a resolver, which I think is a bit different from this. unbound's NLnet Labs also make NSD, which is their authoritative server, and that is one of the servers mentioned and compared to on YADIFA's site.

While unbound isn't entirely on topic, I thought I'd mention that it will possibly be used in Firefox in the future. https://wiki.mozilla.org/Necko/DNS/ResolverIntegration

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