YakiBiki, "Yet Another Blog Like Wiki", is one of Wiki clones.
You can set customizable ACL (access control list) to not only text data, but also images and attachement files uploaded from web browser, and bookmark urls.
If you want to edit, click the "edit" icon on page header.
If you were a beginner for Wiki Format, you can try it at SandBox page freely.
You can break SandBox page contents, no problem, don't worry. Any one can fix, restore it.