Twilio - Brings voice and messaging to your web and mobile applications.

Everleagues - Everleagues is a cloud-based application that offers team communication, file sharing and storage, data tracking, and activities management.

Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates

openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.

Plivo - Plivo simplifies your customer engagement.

Fellow.app - A manager’s co-pilot for 1:1s, meetings, feedback & goals 🚀