I used wire before is opensourced parts of the backend. I thought it was well designed and interesting. They claim to be the only video conferencing with end to end encryption that is opensource. https://wire.com/en/features/encrypted-voice-video/ Has anyone followed wire more closely?
I've heard nothing about Wire recently. Wickr.com is another similar service that claims to be end-to-end encrypted, but again I haven't seen much about them at all.
It would be nice if The Intercept and other journalists would include these actually E2E-encrypted alternatives besides the Mac/iOS-only FaceTime.