If anyone's interested in experimenting with FSRS, we at Open Spaced Repetition provide official packages in Python, Typescript and Rust
PY: https://github.com/open-spaced-repetition/py-fsrs
TS: https://github.com/open-spaced-repetition/ts-fsrs
RS: https://github.com/open-spaced-repetition/fsrs-rs
Currently ts-fsrs and rs-fsrs support FSRS 6 and py-fsrs should also support FSRS 6 in the next day or so. Also, both py-fsrs and fsrs-rs include the ability to optimize the FSRS model from your past reviews!
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