Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...

Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.

Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.

Arvia for Slack - Start quick video calls in Slack channels.

TextMe - TextMe is a free calls and messaging application at both local and international levels.

Moon Dialer - Use free voip & wifi calling app for unlimited international calling. Moon Dialer is one stop solution for call recording, call scheduling and call forwarding.