hakimel/reveal.js

Reveal.js is an open-source HTML presentation framework that lets you build slide decks entirely in a web browser using HTML, CSS, and JavaScript. Instead of creating presentations in PowerPoint or Keynote, you write your slides as HTML pages and reveal.js handles all the slide navigation, transitions, and visual layout. The result runs in any browser, making it easy to share or host presentations online without needing specialized software. The framework works by organizing your content into slides defined with HTML tags. You link the reveal.js library into your page and it handles turning those elements into a navigable slideshow. Slides are arranged in a two-dimensional grid, meaning you can navigate horizontally through topics and vertically through sub-slides within each topic. Key features described in the README include Markdown support (so you can write slide content in plain text rather than raw HTML), Auto-Animate for smooth transitions between slides, PDF export for offline sharing, a speaker notes view for presenting, LaTeX support for math notation, and syntax-highlighted code blocks. There is also an extensive JavaScript API for programmatic control. A companion commercial product called Slides.com provides a graphical drag-and-drop editor built on top of the same framework for people who prefer not to write HTML. You would use reveal.js when you want a presentation that lives on the web, integrates code examples, has version-controlled content (since it is just text files), or needs features that traditional slideshow tools do not easily support. Developers often prefer it for technical talks. The tech stack is plain JavaScript with no build step required for basic use; you simply include the library in an HTML file. It is MIT-licensed.