If you’re looking for something with a little more capability and that fits nicely into a Markdown-centric workflow, there is also Marp: https://marp.app/
I lack words to adequately express how much I prefer Presenter to something like Keynote or Google Slides. It’s just brilliant, and they put a huge amount of thought into making the output look beautiful.
Bonus points for being able to export in PDF, Word, etc. in various combinations of with/without speaker’s notes, ruled notetaking sections ok each page, and a bunch of other pleasant details.
I built presenterm (https://github.com/mfontanini/presenterm). Also a terminal based presentation tool which uses markdown, and supports images, PDF exports, etc.
If you’re looking for something with a little more capability and that fits nicely into a Markdown-centric workflow, there is also Marp: https://marp.app/