Probably jitsi, Nextcloud's meeting app, or some WebRTC based solution. There are a bunch by now. Maybe they aren't as user-friendly as Zoom (I really wouldn't know), but that's not the issue here. Privacy and security are.
May this be a blessing to you during these trying times.
I continue living knowing that Jesus has atoned for our sins.
A social network website (Mastodon instance) devoted to the new life only found in Christ.