For the C compiler that I developed to replace the GNU Mes compiler in the live-bootstrap project, I also used a Forth like language that uses two stack. One stack for parameters and return values and one for the return addresses and local variables. The Forth like language is transpiled in assembly and through some steps made into an ELF file. The targets are: x86, x86_46, and arm64. Work on supporting riscv64 has started, but is currently on hold due to other responsibilities. If there is anyone willing to complete it, I do have some small funds as a bonus.

Point of clarification: Rummaging through that site, and as far I can see - the Forth language is not used.