Roll20 - Roll20 is a suite of easy-to-use digital tools that expand pen-and-paper gameplay.
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.
Astral Tabletop - Create, host, and manage your tabletop role-playing games — online or in person
WebEx - Cisco WebEx Web Conferencing, Online Meetings, Desktop Sharing, Video Conferencing
D&D Beyond - Official online toolset for Dungeons & Dragons tabletop gaming
GoToMeeting - GoToMeeting is a web conferencing service offering a range of services which are available on Mac, PC, iOS and Android devices.