Home page of Ali Gholami Rudi. Found on fefe's homepage
https://www.fefe.de/
His troff implementation Neatroff has been mentioned on TUHS https://minnie.tuhs.org/pipermail/tuhs/2022-January/025071.html
See also https://github.com/aligrudi/neatcc, a a small ARM/X86(_64) compiler for a subset of C; a brief introduction can be found on https://litcave.rudi.ir/neatcc.pdf, a small test suite on https://litcave.rudi.ir/ncctest.tar.gz