Many of the apps are macOS only unfortunately. For Windows, there's Descript or Camtasia. Linux not sure, but Descript and Veed are browser-based.

Yes, I use Camtasia for over a decade. It not only solves screen recording but also most other tasks you would need cutting video and sound.

I chuckled when you said you weren't sure about Linux tools. Real Linux users code all their sleek demo videos inside emacs in hex.

Unfortunately this is one of the places where Linux really doesn't have any good options. While there are definitely raw capture options for Linux, there isn't anything as nice as Screen Studio or Screen Flow or Camtasia for quick, short videos with basic editing.

On Linux I've used SimpleScreenRecorder. Can invoke ffmpeg to screengrab too.

I work for https://www.canvid.com, and we recently released a beta version of our product, which is similar to Screen Studio but designed for Windows. If we see enough interest, we may even release a Linux version around Q3.