BookStack

BookStack is a platform that you can set up yourself to help you create, organise and share information in a neat and easy-to-use way.
It uses a simple structure of books, chapters and pages, which makes it straightforward to group related information and create clear, organised documentation libraries.
BookStack is often used for internal wikis, step-by-step guides (SOPs), onboarding guides, project notes and technical documentation because it provides a clean editing experience, a powerful search function and flexible permissions to control who can see or edit the content.
With its easy-to-use interface and focus on simplicity, BookStack is a practical choice for teams that want a lightweight but powerful way to keep knowledge in one place.
I use BookStack as a wiki for this website and my yunohost domain, digitalcarnage.