Beamer
Beamer is a LaTeX document class for creating presentation slides.
FreeOpen source
Any
Alternatives to PowerPoint
6 tools researchers use instead of PowerPoint: 4 free, 4 open source. Open-source and free tools come first.
Fusuma
A tool to create slides easily for you, using markdown with interactions (mdx).
FreeOpen source
WebMac
OpenSlides (openslides.dev)NEW
OpenSlides (openslides.dev) is a free, open-source presentation studio that runs in your browser. Start from your notes, pick a look, and add motion backgrounds, kinetic type, live charts and interactive widgets. Then present live, narrate it in another language, or export a video, PDF or PowerPoint file. No account, and your decks stay on your device.
FreeOpen source
Web
slidev
Presentation Slides for Developers
FreeOpen source
MacWin
slides.com
Make dynamical slides with synchronous presentations over all devices.
Free plan
Web
Deckset
Deckset designs your slides, so you can focus on your ideas
Paid
Mac
Prices and licences change, so check each tool's site. Missing one? Suggest a tool.