Spectacle
Leading#5 in Open sourcehigh confidence
A React/JSX-based presentation library (~10.1k stars) from Formidable Labs, strong for live code demos and the React ecosystem; actively maintained.Our read
Why it ranks #5
The main React-native presentation framework at about 10.1k GitHub stars, with active maintenance and clear adoption among JavaScript conference speakers.Here is the catch
requires a React build toolchain
more code-heavy than Markdown-first alternatives
not designed to produce editable PPTX files
Does this well
natural fit for React teams
components enable interactive technical demonstrations
reusable themes and programmatic content
Pricing
Checked by hand on 2026-07-23. Prices in this category change often — if this looks wrong, it probably is.
Key features
React and JSX slide compositionThemes and responsive layoutsCode panes and live demosPresenter mode and PDF export
Sources we read
Quick facts
More in this area
The rest of the Open source column.- 1reveal.jsThe de-facto standard open-source HTML presentation framework (~72k stars) — Markdown authoring, PDF export, speaker notes, LaTeX and auto-animate. The most-adopted tool in the entire category.
- 2SlidevThe modern developer favorite (~47.8k stars): Markdown-driven decks powered by Vite/Vue 3 with live coding, Mermaid, KaTeX and PPTX/PDF/PNG export. Also ships its own official Agent Skill (see below).
- 3impress.jsPrezi-style CSS3 3D and zoom transitions with full HTML/CSS/JS control (~38.2k stars). Very high adoption, though less actively maintained than reveal.js and Slidev.
- 4remarkA simple in-browser, Markdown-driven slideshow (~13k stars) for people comfortable with HTML/CSS. A long-standing lightweight option.
- 6python-pptxThe foundational Python library for programmatically generating and reading .pptx (~3.5k stars). Star count is modest but real-world adoption is enormous — it is the engine the Anthropic pptx skill and most PPTX tooling depend on, so it ranks above higher-starred JS tools on adoption depth.
- 7Marp (marp-cli)A mature Markdown-to-slides ecosystem (~3.7k stars for the CLI, plus a popular VS Code extension) exporting HTML/PDF/PPTX. Lower star count than the leaders but a well-adopted Markdown-native toolchain.