knowen is described as 'Knowen is an experiment in progress that is being designed to organize, preserve, and expand human knowledge - placing it in a hierarchical knowledge base (graph) that makes it readily available to learners of all backgrounds and ages' and is an app in the Education & Reference category. There are eight alternatives to knowen for a variety of platforms, including Online / Web-based, Android, Self-Hosted solutions, Cloudron and Wordpress. The best alternative is MediaWiki, which is both free and Open Source. Other great apps like knowen are DokuWiki (Free, Open Source), Ema Personal Wiki (Free, Open Source), Helpie Knowledge Base Wiki Plugin (Paid) and You Need A Wiki (Freemium).
MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis, including this website, the home of MediaWiki.
Ema Personal Wiki uses Markdown to freely create and manage structured notes, like a website. Using WikiWords you can create notebook with linkable pages for tracking your notes, todo lists, bookmarks, your life - in the most flexible way.
Wiki app with markdown editor Start & Doc allow you to create and manage all your docs. Just as a content manager like Wikipedia, you can create pages, write on it your documents but also create links between them in the same way as a website.
NoteLynX is the unique, 3-in-1 Outliner, Mindmap and Personal Wiki with embedded Hyperlinks to cross reference your notes. NoteLynX also lets a child note have Multiple Parents, enabling it to belong to multiple lists.