Zoom - Zoom unifies cloud video conferencing, simple online meetings, group messaging, and a software-based conference room solution.
join.me - Instant screen sharing. Instant Aha!
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
WebEx - Cisco WebEx Web Conferencing, Online Meetings, Desktop Sharing, Video Conferencing
Skype Meetings - Click a button to start a free video call
appear.in - Video conversations with up to 8 people in your browser - no downloads, no login.