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.
Clubhouse - Serious project management tools you’ll actually enjoy using. Estimate, plan, build, and track your team’s work—all without the fuss and frustration you’re used to.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Angle Audio - Live audio conversations as a service
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.
Commons - Private Clubhouse for your team to collaborate and connect