NetBSD is used for sdf.org, the SDF Public Access UNIX System.

Fastly

At least in 2017:

https://twitter.com/fastly/status/934495679849881601?s=21&t=...

We used to run it in the geophysics department of the university for workstations.

Also on Jump Hosts with a weird cpu architecture, so that you could not do much with them

It's "big in Japan". Used on many ISP routers there, for example Internet Initiative Japan's "SEIL" family, as well as most workstations in a few Japanese universities.

pkgsrc enjoys mild popularity in the scientific computing community, a lot of NetBSD use is probably in education - Cambridge University uses it for their thin clients too.

A few in-space satellites I believe.

I know of a few small ISPs that run NetBSD on SOKRIS(sp?) machines to do routing at edge pops.

SDF.org ;)