There are 2 repositories under live-editing topic.
Create explorable explanations and interactive essays.
A graphical editor for creating Idyll documents.
Operational transformation library to build applications and web-services with collaborative access to the data (live data editing).
An MkDocs plugin that allows editing pages directly from the browser.
An example of application with collaborative access to rich text (live text editing) using Collaborative.js and SimpleMDE editor.
A custom element to live edit other custom elements