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Reproducible builds are a thing, I don't know how widespread they are. I know the monero project has that built in so everyone compiles the exact same executable regardless of environment, and can verify the hash against the official version https://github.com/monero-project/monero
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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OpenSK
OpenSK is an open-source implementation for security keys written in Rust that supports both FIDO U2F and FIDO2 standards.
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800-63-3
Home to public development of NIST Special Publication 800-63-3: Digital Authentication Guidelines
They accepted edits via pull request when that was in the works! [1] Such a better model of giving feedback or suggesting edits compared to sending in a marked-up PDF.
[1]: https://github.com/usnistgov/800-63-3/pull/576