[daveevad]

The attempts have been made, but for some reason it hasn't taken off.

https://github.com/google/end-to-end

https://github.com/YahooArchive/end-to-end

[lern_too_spel]

These projects depend on some way to discover public keys, but Keybase is not federated and https://github.com/google/keytransparency/ is way behind schedule.