[goffi]

pandoc has the killer feature to use beamer to convert markdown to a good looking presentation. It's the simplest and quickest way of doing a presentation I'm aware of, you can just focus on the content: `pandoc -t beamer some_presentation.md -o some_presentation.pdf`

For diagrams, I'm using draw.io (it seems that it's called diagrams.net nowadays), it's FOSS, easy to use and feature-full. It's then easy to add it in the presentation by using the markdown syntax for images.