As experiment, I have ported some code under Cyclone Scheme. It is an interesting Scheme language implementation in that:
Unfortunately, at the time of this writing (May 22, 2020), Cyclone does not explicitly support handling C language source files with the same flexibility of the hand–written ones: generating object files and linking them into executable programs, shared libraries, static libraries. It has some requirements to how the shared libraries must be generated and installed; I do not like them.
Dorai Sitaram’s Pregexp regular expressions library. Github. Bitbucket.
A port of srfi-78 Lightweight Testing. Github. Bitbucket.
Port of Dorai Sitaram’s ScmObj to Cyclone Scheme. Github. Bitbucke.