Facebook Messenger is one of the most popular messaging apps on the planet. We know that a lot of people don't like the app. We agree that it still needs a lot of work. However, there are so many people that use Facebook that Facebook Messenger just makes sense. The video chat experience works relatively well. Since most of the people you know are on Facebook, it's easier to use this app than to convince everyone to join a new platform. Plus, the new ads rolling out aren't great. It's not perfect, but it's perhaps the most convenient of the video chat apps on this list. At least it's free.
Video doorbells and home security cameras offer many of the same benefits. Both will show you what is going on outside of your home, both offer motion detection and motion-triggered recording, and in most cases, both let you speak to whoever is out there. That said, the simple fact is that security cameras lack the doorbell component. If you're downstairs doing the laundry and your phone is upstairs, a security camera won't tell you that someone is at the door, but the doorbell will (when pressed).
KineMaster is one of the most powerful video editor apps available. You can do the basics like most of these other video editors can. However, this one includes multiple video, image and effect layers. Additionally, there are audio filters, chroma key (for your green screen fans out there), various video effects, transitions, and more. It's not as powerful as a full desktop editor. However, this gets much closer than most other competitors. We would recommend this for actual video production (at least for stuff like YouTube). You can use it for free in trial mode for a while. However, you'll need the $4.99 per month subscription to get everything forever.