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
Zeplin - Collaboration app for UI designers & frontend developers
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Abstract - A secure, version-controlled hub for your design files
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.