Telescope allows you to create a collaborative documentation that will be generated as a static site with an interactive graph to explore the content.
Web base mindmaps creation software
source code : https://github.com/drichard/mindmaps
mindmaps is a prototype of an HTML5 based mind mapping application. It lets you create neat looking mind maps in the browser.
WiseMapping is a free web based mind map project. The goal of this project is to provide a high quality product that can be deployed by enterprises, educational and academic institutions. WiseMapping is based on the same code product supporting http://www.wisemapping.com.