On SDF, mostly. Locally, in a VM since a lot of my machine’s bells and whistles are only enabled in Linux (and the commercial OSes).

On personal devices because I like the OS, pkgsrc, portable software, and the community.

Mainly at home. I have several old Apple G4s i run NetBSD/macppc on. A few years back I wrote short guide on installing NetBSD on these machines. http://www.rabbitfarm.com/cgi-bin/blosxom/netbsd

It’s my OS of choice, and the with the passing of time I eventually installed it on most of my hardware:

• Thinkpad T460 (amd64), my current daily driver. HW probe
• Thinkpad R51 (i386), for retrogaming: dual-booted with FreeDOS
• Mac Mini G4 (macppc), for fun stuff and as DLNA.
• Workstation (custom build, triple-booted with Windows and Slachware; HW probe) . Mainly used for development and building packages
• Raspberry Pi4 (evbarm64), my main server (web, ftp, nntp, mail, matrix, git)
• Raspberry Pi3 (evbarm64), secondary server (firewall + DNS)
• SDF and tildeverse (tilde.pink)

I always wanted a SPARC machine but never got one.

On SDF for ages, and a few raspberry pi since model 1