This is the first binary release of the emulators, currently for Linux x86_64 only. These are statically compiled on Rocky 8 with only glibc 2.17 (from 2012) as a dependency so they should run on most distros.
The tarball includes emulators for RV32D and RV64D. If you need RV32F or RV64F you must still compile from source.
The JSON file is intended for use with asciidoctor-sail to allow inclusion of Sail code snippets in documentation.