deroff(1) on OpenBSD
The text 579cbe33bc0a, as OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9, OpenBSD 5.8, OpenBSD 5.7, OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4, OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9 shipped it.
remove nroff/troff, eqn, pic and tbl constructs
Flags it lists
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-i -
-k -
-m -
-p -
-w