VivaVideo is one of the exceptionally popular video editing apps. In practice, though, it's a very middle-of-the-road video editor. It works especially well for short clips for social media. The app uses a storyboard style of editing where you load clips, edit and trim them as needed, and then move on to the next segment. It includes over 200 video filters and various other effects, text input, and fast and slow motion support. VivaVideo has a free version that comes with a watermark and a time limit for any given video. You can remove these restrictions by buying the pro version.
I test each service's prominent features, but it's up to you to decide whether or not you need dial-in numbers, VoIP, or both options for your audio, and whether or not you need video calls in addition to screen sharing. Some services offer both teleconferencing with dial-in numbers (local or toll-free) and VoIP calling, while some offer just one or the other. A few offer international dial-in numbers. Adobe Connect doesn't offer teleconferencing at all but can be integrated with a number of other services. Most offer video calls via webcam, although a few don't.
Signal Private Messenger is one of the most popular privacy chat apps. It features end-to-end encryption for all messages, voice calls, and video chats between two Signal users. It focuses a lot on individual chats. There are group chat features, but it's mostly for personal use. This is one of the biggest differences between it and rival privacy chat app Telegram. Video calls worked fine in our testing so we have no trouble recommending them. It's a neat way to get some encrypted chats as well. The app is also completely free and open source. You can't really go wrong with it, but there are better video chat apps if you need group video chats.