OpenSource Alternative to TheBrain?

m1cajah asks: "Been scouring the Net for an open-source alternative to The Brain. Specifically, I'm interested in a web version to use for creating a small intranet/portal site at my company. Does one exist out there? I've looked at some of the mind-mapping stuff out there and what's available just isn't as elegant, easy to use, or intuitive as TheBrain. TheBrain has a web-version called "SiteBrain" but it's cost is WAY too high for our little company (only 15 of us) and requires far too much "consultation" to make it work. Does anyone know of a nice alternative?"