Slack - A messaging app for teams who see through the Earth!
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Flock - A faster way for your team to communicate
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
RingCentral Video - Live life unlimited. Free video meetings and team messaging in one app that works the way you do.