Slack - A messaging app for teams who see through the Earth!
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Mattermost - Mattermost is an open source alternative to Slack.
Nextiva - Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.