I've created an online WYSIWYG editor for building static documentation sites for products - TileDocs (https://tiledocs.com).

Its capabilities are currently limited, but it's suitable for creating attractive documentation websites.

Key features include:

* Create workspaces with tree-style navigation

* Organize content into groups and folders

* Basic text editing components (paragraphs, headings, lists, quotes, etc.)

* Code blocks with syntax highlighting

* Image insertion

* Markdown import and shortcut support

* Built-in search functionality

GitBook inspired this tool. I loved how easily you could create beautiful, user-friendly docs with GitBook. But not being able to deploy those doc pages on my own website was a deal-breaker.

My editor allows exporting to a static website that can be used anywhere. And it is completely free.