https://codeberg.org/tarleb/querverweis
- crossreferences for markdown documents
https://github.com/pandoc-ext/info
- collection of misc lua filters
https://github.com/topics/pandoc-filter
- github search for pandoc filters
https://github.com/jez/pandoc-sidenote
- Tufte-style sidenotes, to be used together with https://edwardtufte.github.io/tufte-css/ or https://github.com/jez/pandoc-markdown-css-theme