Tiki

Organize and store information. Stores documentation in a book like fashion.

Easy to use, lightweight, standards-compliant wiki engine with a simple syntax allowing reading the data outside the wiki. All data is stored in plain text files, therefore no database is required.

Wiki software package that powers Wikipedia and all other Wikimedia projects, serving hundreds of millions of users each month.

Complete markdown-powered wiki contained in a single PHP file.

Wiki-based system for collaborative creation and maintenance of websites.

Lightweight, mutli-user, flat-file-database Wiki engine. Create pages quickly and edit them in your Web browser using Mardown/HTML/CSS/JS. The main difference with other wiki is that you are encouraged to customize each page style individually.