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manim
A community-maintained Python framework for creating mathematical animations. (by ManimCommunity)
A famous one is manim for math education animations.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Gleam
Gleam is a graphics library written in Haskell that uses the web-browser as a display. Gleam is inspired by Gloss and uses Threepenny-gui as its back-end. (by Ebin-Benny)
Gleam
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Pandoc is an extremely powerful tool that converts between dozens of different formats (including outputting 7 different slideshow formats). For example, you could write a document in markdown and convert it to reveal.js. Or you could write the document in LaTeX and convert to a powerpoint file. There's also a pretty flexible templating system and support for Haskell/Lua plugins, so it's pretty easy to get the output to look like you want it to.