[tdkl]

Wire has launched in 2014 with emphasis on encrypted calls, it was only recently open sourced.

It also ticks many boxes, only it's not decentralised and the server ain't open source (yet).

[tagrun]

Signal/TextSecure was released in 2014.

Can you be specific about the "many boxes" you're referring to? The most relevant to the grandparent being: has it ever been audited?