I used OpenBSD in production at my previous job (an ISP), in a few different roles. Lots of ISPs use OpenBSD for various purposes.
HSMs from nCipher used to run on top of (a slightly modified, IIRC) OpenBSD. Just as JunOS (the OS on (some) Juniper network devices) runs on FreeBSD, I'm sure there are many other commercial products built on OpenBSD as well -- we just don't hear about them very much.
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Related (from the same author as this submission): "Why OpenBSD?" [0].
HSMs from nCipher used to run on top of (a slightly modified, IIRC) OpenBSD. Just as JunOS (the OS on (some) Juniper network devices) runs on FreeBSD, I'm sure there are many other commercial products built on OpenBSD as well -- we just don't hear about them very much.
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Related (from the same author as this submission): "Why OpenBSD?" [0].
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[0]: https://www.cambus.net/why-openbsd/
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