- Filen @filen (#e2ee cloud #backup),
- DeltaChat @delta (email client supporting #autocrypt),
- Crowdsec @CrowdSec (malicious ip blocker for servers),
- Dangerzone @dangerzone (for opening attachments safely),
- Notesnook @notesnook.

#autocrypt works with K9 on android and with enigmail for Thunderbird btw. Just to provide the 110% certainty ? here:

https://autocrypt.org/dev-status.html

Also, users in repressive states seem to have more problems with necessary phone numbers – exposing them on a new level. Delta-Chat relies only on internet connectivity and it is easy to setup throw-away-accounts.