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http://www.informatik.uni-bremen.de/~net/unroff/

Unroff is a Scheme-based, programmable, extensible troff translator
with a back-end for the Hypertext Markup Language. Unroff is free
software and is distributed both as source and as precompiled
binaries.

[...]

In contrast to conventional troff ``converters'' (usually Perl scripts
some of which process nroff output) unroff includes a full troff
parser and closely mimics the troff processing engine. This enables
unroff to handle user-defined macros, strings, and number registers,
nested if-else requests, arbitrary fonts and font positions, low-level
formatting requests such as \l, \c, and \h, and idiosyncrasies such as
troff copy mode and the subtle differences between request and macro
invocations. Unroff has adopted a number of groff extensions, among
them long names for macros, strings, number registers, and special
characters, and the escape sequences \$@ and \$*.