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I recently looked at saltpack, age, opmsg and ncrypt which are all modern alternatives to PGP, and saltstack looks nice but has zero key management functionality.
Which is understandable if you look at it as part of Keybase stack, but makes it quite useless for standalone use.
Age is probably the most intuitive and usable out of these. Opmsg is more cool in terms of #cryptography features but follows the ways of PGP in cryptic user interface.