Voice-Family: Leo having a conversation with Sheldon in an episode of "The Big Bang Theory".
No, Unbound and NSD do not have HTTP servers. Come on. I was just trying to explain a complicated concept in a half sentence; it's called an analogy.
To make the pedants happy: A DNS server is, if you will, akin to an office suite. Yeah, what's really going on is that there is an "authoriative DNS server" that serves arbitrary name-to-data mappings so that programs called "recursive DNS servers" can give said mapping to a client program and there's also non-recursive forwarding DNS servers and blah blah blah. I think the audience is falling asleep at this point...
Now, when I said above that a DNS server is akin to an office suite, I wasn't saying that there is a spreadsheet and a word processor included with DNS servers. However, if someone were willing to sponsor it, I would be perfectly happy to make a version of MaraDNS that uses SINK RRs and dynamic updates to allow people to perform document collaboration via DNS.