For some documentation we are using https://www.bookstackapp.com/ https://www.bookstackapp.com/ , we have also few instances for clients internal docs. What is

For some documentation we are using https://www.bookstackapp.com/ https://www.bookstackapp.com/ , we have also few instances for clients internal docs. What is especially nice (less for us, more for some of clients) is that it has clear, understandable and working out of the box ACL system in place - and this is not obvious or easy to setup/configure for many wiki-like projects out there. For maintenance and filling knowledge-base - I think that what's works for us is establishing and following rules, for example: one cannot mark feature as complete without creating/updating documentation page related to it, documentation maintenance is checklist element of task completion flow.