TITLE: PDF readers for presenting Math online
QUESTION [14 upvotes]: In the current situation it seems especially important to be able to present your mathematical results online in a way that your audience does not fall asleep in front of their screens. But I am struggling to find suitable software one could use to enhance the usual beamer LaTeX presentations with some handwriting/drawing.
So I am searching for the following features:

Allows to present PDFs, as generated by the beamer Latex package
Compatibility with usual video conference software (should be easy, just share your screen)
Easy to use and easy to access handwriting tools (pen, colors, laserpointer, etc.)
Drawing should stay on the slide you drew them on, so you can go back to them and save them after your talk
Program and Toolbar should not be visible to the audience (so maybe campatibility with 2 screens would be necessary here)
Additionally: Shows next slide, time, additional notes, ... (only for the speaker)

What is the best tool you know for this purpose?
PS: I am not restricted to any operating system.

REPLY [4 votes]: If your presentation is based on a Beamer file, I recommend PdfPc. It supports a hidden dashboard for the speaker, showing previous/next slides and some annotation and pointing tools.
Moreover, it allows you to jump among sections without having to run slide by slide - which is particularly cumbersome when a single frame corresponds to multiple pages on the pdf file.
In practice, when using PdfPc you then would only share the presentation window (but not the speaker dashboard) on your video conferencing software.