What are some alternatives?
When comparing Async and Online Video Call, you can also consider the following products
FireRTC - FireRTC is the easiest way to call from your computer for free
Unfuddle - Unfuddle is a secure, hosted project management solution for software development teams.
VideoMeeting - VideoMeeting is a free and open source video conference solution built to have video calls and chats using your web browser. It is deployed on top of hubl.in.
Slack - A messaging app for teams who see through the Earth!
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
BobRTC - BobRTC is a VOIP platform dedicated to thwarting telephone fraud, illegal robocallers and scams.