I have been using Safeswiss for a while now and found it exceptionally good. The new Droid update looks very modern, some really need features that you don't find on other messengers, push to delete anytime works very well, I also like signup requires no phone number or email, Unlike Telegram, all messages & voice calls are fully encrypted by default - Very good worth a try
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
RoomChat - No sign up chatrooms with just a URL and your handle
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Chatty - Chat with strangers all around the world in Messenger
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Ablo - Say hello to the world