Screencast tools for linux

For screen draw:
gnome add-on "Draw on Your Screen":
  https://www.omgubuntu.co.uk/2019/03/draw-on-your-screen-ubuntu-linux

For for keyboard and mouse actions:
key-mon:
  https://www.youtube.com/watch?v=raw0OtUej6k

For screen and audio record:
  vokoscreen: https://www.youtube.com/watch?v=__zZnv8-Keg