You can embed a freemind document in the wiki using the following steps:
The Iframe extension allows an iframe to be embedded in a wiki page. To configure the extension, follow the steps on this page: IFrame Extension
In the editor, create an iframe like this:
{{ iframe{uri: "http://deki-freemind.appspot.com/freemind/view?uri=http://www.blissjunkies.org/freemind/index.mm"} }}
Change the uri querystring parameter to point to your Freemind file.
NOTE: http://deki-freemind.appspot.com is a Google App Engine application with a built-in server-side proxy for fetching the file specified by the "uri" querystring parameter.
What do I need to do to install that freemind extension locally?