Emacs Freex mode is a minor mode for organizing and editing a massively-hyperlinked database of your notes and ideas. It’s a personal wiki on steroids. Per Sederberg & I released the Emacs Freex code under the GPL two years ago.
There are probably still some teething problems with the installation instructions, and I think perhaps I could be clearer in the screencast. Do let me know what I can do to make it easier for new users.