Mentioned in the article: manual nbconvert, nbdime, ReviewNB (currently GitHub only), jupytext.
Jupytext includes a bit of YAML in the e.g. Python/R/Julia/Markdown header. https://github.com/mwouts/jupytext
Jupytext includes a bit of YAML in the e.g. Python/R/Julia/Markdown header. https://github.com/mwouts/jupytext