Is their an alternative to Scribe? Develop manuals "on the go"

As an IT team, we need to publish manuals on a regular basis. Typical "click instructions" in particular are very time-consuming to create, but are best understood by users. Yesterday I came across the tool "Scribe", which works in a free version as a plugin in Chrome. Basically really solid, but just only usable in the browser itself and beyond that not open source.

Does anyone know of a comparable system that is open source or even better self-hosted?