I am the developer of Contextualise (<a href="https://contextualise.dev/" rel="nofollow">https://contextualise.dev/</a>), an open source tool for managing your own (documented) knowledge base. The application is still in alpha and I’m in the process of writing/recording tutorials, but it is fully useable. To make the most of the application you need to understand topic maps: <a href="https://contextualise.dev/topics/view/1/topic-maps" rel="nofollow">https://contextualise.dev/topics/view/1/topic-maps</a>