Firepad - Open source collaborative code and text editing that relies on Firebase for real-time data...
join.me - Instant screen sharing. Instant Aha!
CryptPad - CryptPad is a collaborative office suite that is end-to-end encrypted and open-source.
WebEx - Cisco WebEx Web Conferencing, Online Meetings, Desktop Sharing, Video Conferencing
eduPad - Real-time collaborative text-editor. No account required. Edits highlighted in authors color.
GoToMeeting - GoToMeeting is a web conferencing service offering a range of services which are available on Mac, PC, iOS and Android devices.