After the last flare up on Twitter, I thought they wrote their own implementation, using the Signal code as a reference.
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I've been using Wire for a few weeks now and I'm absolutely happy. They recently released a linux client https://medium.com/wire-news/get-your-linux-on-999403a1a4fe#... (not a chrome app!) (though I think it's electron).
I'm quite happy with them, give them a try.
Possible reason: https://medium.com/@wireapp/axolotl-and-proteus-788519b186a7...