Zoom, Gotomeeting, Skype, SkypeForBusiness(Lync), Hangouts, Some shitty free meeting telephone service, Whatsapp, Email, Trello, etc...

Whatever is convenient for the customer really. Often though, you get the chance to recommend a tech to someone, so take that opportunity, but I figure that I'm the tech guy. If they've got a meeting software that they're happy with, well the least I can do is fit in.

I'm not too worried having a few smaller meeting-based apps on my machine though.