I've successfully taken part in meetings using zoom messenger, google hangouts and microsoft teams. My video out is rather poor, but everything else works.
Skype refuses to recognise my camera.
Some of these have participant limits but hangouts has raised the limit from 10 in the last week, not sure if it will now be enough but it is one of the easiest to use.
Teams won't work with Firefox but I use the app or I could use <spit> Edge.