I am not familiar with this product, but based on the brief blurb, I'm working on a Free version: http://www.onemodel.org. The web site is really outdated but the code works as the best personal organizer I've ever used. Very efficient, unfortunately I haven't posted the .jar to download yet so you have to compile it, and configure postgres, but I hope to get the web site updated with a free .jar, in a couple of weeks.

At the moment it's keyboard-driven, desktop-only. But everything you need to know is on the screen, and it is very efficient for note-taking, brainstorming, making lists of lists, everything interlinkable, and lets you store either lists of blurbs or as mapped to reality: ie, entities that have attributes like an object model built on the fly by virtue of just using the system. There's a mailing list ready for use.

Again, I meant to have the web site better updated with the current status, but the INSTALLING in github is accurate, the tools works well and has good data integrity and high efficiency. I use it for everything now. And I'll try to post a jar within a couple of weeks. I'm just really slow right now.

I think the possibilities with the concepts are very big, and it's a working foundation.