[anujsharmax]

Beamer (https://en.m.wikibooks.org/wiki/LaTeX/Presentations)

I usually use LaTeX, because it works on all the major OS and frees me from learning different software

[wahern]

I use Beamer and I use macOS.

macOS has great PDF support. Preview.app understands ToCs and full-screen presentation mode. It's been awhile since I've used any Linux GUI apps, but IIRC the typical Linux PDF viewers had all the right features, too.

[sdan]

I use Beamer with TextMate and Skim.