What are some alternatives?
FireRTC - FireRTC is the easiest way to call from your computer for free
GitPrime - GitPrime uses data from any Git based code repository to give management the software engineering metrics needed to move faster and optimize work patterns.
BobRTC - BobRTC is a VOIP platform dedicated to thwarting telephone fraud, illegal robocallers and scams.
TeamTalk.io - TeamTalk provides 1 - click meetings, audio -video calling, screen sharing, audio recording...
Backlog - A cloud-based project management app for developers and their teams.
Slack - A messaging app for teams who see through the Earth!