Despite macOS having built in screen annotation tools, there are a lots of great apps out there. what app is the best macOS screen annotation tool option?

I Tried Out Google Beam at Google I/O Tech Services & Software YouTube adds annotation tool for video creators only Add annotations to videos now with YouTube.

Web annotation tool Webnotes gets pro flavor Annotation service now has a professional version for users who want to mark up PDFs along with normal Web pages.