qTox - A Qt graphical user interface for Tox.
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.
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
uTox - µTox is the lightweight client with minimal dependencies; it not only looks pretty, it runs...
WebEx - Cisco WebEx Web Conferencing, Online Meetings, Desktop Sharing, Video Conferencing