Here's a link to a new tool called "Screenflow" (iOS, $99, Softonic) which allows those constructing the lessons to "work smarter, not harder" and maximize the technology to reproduce brief lessons. For example, a teacher could create a digital lesson covering the course syllabus and save valuable synchronous class time. Another example would be to create a standalone orientation to serve as an advance organizer for students who are navigating or matriculating through a new educational system.
If you are looking for similar FREE or PC/MAC programs, here's a link to 6 Tools to Share Your Computer Screen with Others. Brief overviews and links are provided.