I was planning on mentioning Zoom as well. The Linux client especially is insanely bad, iirc it also drew itself on top of everything.

My suggestion on Linux at least is to use the web client. Just get the url, do a 's#/j/#/wc/join/#' to it and open it in browser of your choice. You'll need to copy the password manually, sometimes it might require captcha etc, but at least it's somewhat usable.