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.
Zulip - Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
AudioPen - The easiest way to convert messy thoughts into clear text
WowApp - Wowapp is the best alternative to Skype and you will get paid to use it!
Voiceliner - The fastest way to capture and structure your thoughts: through voice.Hold record, speak, and release.
WhatsGreen Multi Messenger - Easy access to WhatsApp, Line, Telegram, FB Messenger and many others via the Chrome toolbar.