What are some other services like zoom?

Cisco Webex

Microsoft Teams, Jitsi

Google Meet

I'm no fan of Google but I have always vastly preferred Meet to Zoom.

Teams, Meet, Skype, BlueJeans, WebEx, GoToMeeting, etc, etc. I still think Zoom is the best of the lot.

Whereby

Jitsi

Google meet

Discord can be a good alternative.

WhatsApp's desktop version

Found this one the other day, Jugo.io/x

Signal offers video calls

https://signal.org/blog/signal-video-calls/

If you want a freeze as in freedom solution.

https://jitsi.org/user-faq/