Deskreen is a free software that turns any device into a secondary screen for your Windows, Mac or Linux computer.
Epic Pen lets you create on overlay over the desktop, so you can draw, write, highlight any part of the desktop or any software in real time allowing you to switch over your notes and work. It’s very easy to use and it’s user-interface it’s simple. Whether you are using it for notes, games, drawing, …
How to record desktop audio with OBS Studio and Soundflower or loopback on Mac?