The important part is the notions about how to write—shifting the idea of a “note" from a write-once log to structured elements intended to be updated over time. I do my writing with
The webapp I use to publish notes online isn’t open-source (it’s quite a kludge), but a number of commercial products implemented my design: Obsidian Publish, Craft, Roam Garden. There’s also a Gatsby theme (https://github.com/aravindballa/gatsby-theme-andy…) and a TiddlyWiki plugin (I forget)