In this wiki you can collaboratively create and edit pages and sub-pages to create a project wiki.

You can:

• insert text and format it with the toolbar,
• insert text and images with copy and paste,
• paste formatted text directly from MSOffice documents,
• create a page hierarchy by inserting parent pages,
• use makros to include, e.g. table of contents, work packages lists or Gantt charts,
• include wiki pages in other text fields, e.g. project overview or meetings,
• reference tickets with one, two or three "#"+ticket number, depending on what information should be displayed,
• include links to other documents,
• view the change history,
• view as Mardown.

More information:
https://www.openproject.org/help/wiki/