Support for 4K video source content has become pretty standard in video editing software, but the support varies among the products. For example, some but not all of the applications can import Sony XAVC and XAVC-S formats, which are used by Sony's popular DSLRs, mirrorless cameras, camcorders, and professional video cameras. The same holds true for the H.265 High Efficiency Video Coding (HEVC) standard. Most of the applications here now can import and export HEVC, though there are still a few holdouts.
Viber began life as a voice calling app. You used to be able to call people on the service along with regular phone calls. It has since evolved into a full-fledged messaging service. You can still make phone calls like you could before (for a fee). You can also text chat, video call, and more. It also features encryption on voice, text, and video calls between Viber users. There are a few extra fun features like hidden chats as well. It's a little bit heavier, similar to Facebook Messenger. However, it's otherwise not bad. The app isn't overly popular in the United States, but it's quite big Internationally. The in-app purchases are for things like stickers and other personalization items.
Many video editing apps now include tools that cater to users of action cameras such as the GoPro Hero7 Black. For example, several offer automated freeze-frame along with speedup, slowdown, and reverse time effects. CyberLink PowerDirector's Action Camera Center pulls together freeze frame with stabilization, slo-mo, and fish-eye correction, and color correction for underwater footage. Magix Movie Edit Pro Premium includes the third-party NewBlue ActionCam Package of effects. And Wondershare Filmora lets you subscribe to new effect packs on an ongoing basis.
Imo is a simple video calling and chatting app. It boasts compatibility for 2G, 3G, 4G, and LTE networks. That makes it good for those stuck on worse connections. It's also compatible with both iOS and Android. Otherwise, there isn't much to this one. That's not necessarily a bad thing. Aside from text chatting and video calling, this app doesn't have any bloat holding you back from a simple experience. It's free to download and use. The only thing you'll need to deal with is some advertising.
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.