Request for guidance - wiki with map of connections
Sorry if this isn't the right place to ask this. But my friend wants to write a philosophical treatise, and he has asked me to develop a web application to help him do this, and to share it when it's finished. Essentially he wants a wiki, with a visual map of the connections between articles. For the wiki we would ideally like a WYWIWYG editor to which we could add some extra functionality. Any guidance on this would be much appreciated.
Here are a set of mockups which show basically how it would work. They are using Mac TextEdit as a basis but we would like to make a web app rather than a desktop application.
Thank you for your input!