Replacing OpenPGP in 2019
It's 2019, and OpenPGP has to die already (for very many reasons I won't list, but see 1, 2 and 3). At least for most uses.
I'll try to list here some replacements categorized by usage (also see 5), because there's no one single-do-all app, and there shouldn't be!
All of this resurfaced because of a vuln exploited recently on SKS keyservers (that has NOTHING to do with OpenPGP nor GnuPG but yes, they're related to the environment) (see 4).
Note: only FOSS software listed (although some server-side implementations could be closed, where applicable).
Listed apps are in no particular order. You should analyze your threat model to know which one to prefer, but as a rule of thumb, go for an easy-to-use one than doesn't let you make a mistake an lose security.