I’ve heard good things about ghost.

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Wonders why the web is shit

Signal also has been a leader when it comes to encryption and metadata protection. Their cryptographic protocols are public domain and are the gold standard for private messaging from pretty much every perspective other than decentralisation. (it’s still centralised)

Signal is American but run by a non profit so it can’t be sold and is open source under GPL3 without a CLA from what I can see so it’s unlikely they would ever go closed source.