Zoom seems to work pretty well for big groups and work and has some decent features. Used to to guest lecture in a USC class yesterday and was impressed with how it worked for a large number of people. Def worth a look
We've had to move over to Microsoft Teams with work, and I'm surprised to say I'm quite taken with it. It has helped to ensure that the 'social distancing' advocated is, instead, 'physical distancing' because in the past most of my group meetings were done physically whereas this week they've included colleagues from the States, Brazil and Sweden.
Every work day is now a juggle of Skype, Zoom, Webex and Microsoft Teams. Plus constant pinging whatsapp and emails. Of those, only Microsoft Teams is 'new' to the equation, as we've been using Zoom for ages, and a lot of our clients/partners use Webex. But the fact every conversation is now virtual with zero face-to-face is quite tiring; you find your day consumed more with managing conversations than doing work.