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I know of Keybase though stagnant after Zoom acquisition.
Matrix.org but it requires a trusted server I think?
Velidchat is new so I don't really know about it.
PGP signed email? Hard to setup and work with.
Signal has some fairly serious deficiencies. That's why, along with it, I have 4 others installed, one of which seems to stand above the rest (and I bet, just reading this, you know which one I mean).
Is it so wrong to say so?