BookStack
Documentation & Wikis
Self-hosted wiki that organises content into books, chapters and pages.

Self-hosted means you run the software on infrastructure you control. Some of it is free, some of it is paid — both belong here, and every entry states which one it is.
Every entry shows the price model and the licence of its self-hosted edition.
Documentation & Wikis
Self-hosted wiki that organises content into books, chapters and pages.
Documentation & Wikis
Self-hosted wiki and documentation platform with real-time collaborative editing.
Also offers paid editions — see the detail.
Documentation & Wikis
Self-hosted wiki and documentation platform on Node.js, with Markdown and WYSIWYG editors, Git sync and page history.
Free and paid, clearly splitEvery entry states the price model of its self-hosted edition. A paid cloud plan never implies the self-hosted edition is paid.
Licence is not priceOpen source, source-available and proprietary are separate facts from what an edition costs, and both are shown.
Unknown stays unknownIf we could not read a price from a vendor source, the entry says so instead of showing a guess.