[wiktor-k]

The standard is quite new but there are already libs with full support (e.g. the pure Rust OpenPGP: https://fosstodon.org/@hko/113198947595455844).

One interesting thing is that there's a test suite checking implementations developed alongside the spec (https://sequoia-pgp.gitlab.io/openpgp-interoperability-test-...) so it's easy to see the conformance status.