simplexchat

SimpleX Chat is a private and secure messaging app that emphasizes privacy by not using user IDs,
including phone numbers or random identifiers. Instead, it uses temporary anonymous pairwise identifiers for message delivery,ensuring no long-term identifiers exist.

The app features end-to-end encryption, decentralized groups and anonymous credentials to enhance security.
Users can control their data, avoid spam and abuse, and connect via servers or Tor for added privacy

This is a desktop companion application. It needs to be connected to the mobile phone version to work.

This snap also includes the CLI version: https://simplex.chat/docs/cli.html
You can run it with: simplexchat.simplex-cli

To create an alias use:

sudo snap alias simplexchat.simplex-cli simplex-cli

Then you can run it via simplex-cli.