There is a new release (0.7) of Riscyforth – my Forth for RISC-V based single board computers available – Riscyforth 0.7.
This release adds significant support for 64-bit IEEE754 floating point numbers to broadly match the 2012 Forth standard.
The implementation of the Forth floating point word set isn’t yet quite complete and Riscyforth does not operate a separate floating point stack, but I would expect most standard-compliant code to run. If it does not please file a bug report on Github.