groff -step -k file.groff > file.pdf
Groff+mom it's like Texlive for TeX.
The last one it's best suited for writers.
With Groff+ms you can typeset equations, letters and articles with a 486 and less than 50MB of used space. It's a gem. Postscript can be set with -Tps for Groff, it may be lighter on rendering. The GV viewer opens both PDF and PS files.
Apparently mom and ms are some packages full of macros to use with Groff. I am not familiar with these tools and was a bit confused until I read some man pages.
A very useful feature, considering so many young kids, specially with not so doing well house income, can have Raspberry pi and produce good looking reports etc for school/ extra curricular activities, comparable to those produced by much powerful and costly hardware and software systems.
I used Groff+mom on a raspberry Pi 3b, and results were quite good for text heavy documents with some tablular data.
There are also some that insist on exe submissions along with your source. That mingw can cross compile for X86_64 Windows from the Raspberry pi so easily is an awesome testament to how nice a dev environment GNU/Linux is.