It's called: Jitsi-Meet
Yes, for iOS and Android: https://jitsi.org/#download
and for OSX and Windows as alternative to the browser: https://github.com/jitsi/jitsi-meet-electron/releases
As alternative to the browser
- for MacOS/OSX https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet.dmg
For Windows: Cancel the firewall warning at the first start, then set the correct display name (otherwise the Windows login name is taken) and server (https://jitsi.kh-berlin.de) at the cogwheel. Admin rights are not required.
Here you can see which version is the latest one: https://github.com/jitsi/jitsi-meet-electron/releases