Includes gui and cli options, but as far as I can see not more involved setups like https://github.com/jonaswinkler/paperless-ng .
An absolutely amazing guide and introduction into NodeRED programming (and the idea of flow-based and IoT programming in general).
It is sorted by examples and the chapters go deep into creating useful flows. Really, really good.
A quick overview on how to handle async processes in luv in Neovim.
Uses example of spawning a pandoc process, which is a good example starting point for reviewing implementations.
JSONata query and transformation language. Small introduction.