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GoToMeeting by Citrix is an easy-to-use workhorse that's popular worldwide. Combine audio, video, and screensharing to connect with people who "attend" a session.
It's Mac- and PC-compatible, has a free mobile app, can accommodate up to 100 people, provides group and private chat, offers on-screen drawing tools, and has an easy, 1-click record feature.
Multiple plans are available. The free version hosts up to 3 attendees, doesn't require a signup or download, offers full video conferencing and screen sharing, and is available for Chrome and Firefox. Paid plans begin at $39/month and offers a free 1-month trial.