[kincl]

I just realized that OpenBSD unbound was likely named as a counter to ISC BIND. Similar to Sun Java and the Eclipse Foundation.

[somat]

It is not really openbsd's unbound, it is nlnet labs unbound. openbsd just ships it with their operating system.

https://nlnetlabs.nl/projects/unbound/about/

but yes it was made to avoid a bind monoculture. and comes in two parts nsd is the authoritive name server. and unbound is a recursive name server.