roff is probably very uncommon in these days. But not unheard of. A recent example is Donovan and Kernighan’s book The Go Programming Language which was typeset

roff is probably very uncommon in these days. But not unheard of. A recent example is Donovan and Kernighan’s book The Go Programming Language which was typeset using an XML and groff toolchain. It was featured on HN a few years ago, see https://news.ycombinator.com/item?id=11470905 https://news.ycombinator.com/item?id=11470905