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.
Zello - Zello's push-to-talk app redefines the walkie talkie. It's a great push-to-talk over cellular (PoC) alternative for businesses and organizations. Learn more about the best walkie talkie app in the market.
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.
NuovoTeam - NuovoTeam Push-to-Talk (PTT) App for Frontline Workforce.
WowApp - Wowapp is the best alternative to Skype and you will get paid to use it!
Breakr - Influencer marketing to break music to wider audiences