as seen at NTK: check out GZigZag , now at version 0.5.1 (released 2001/01, so, ok, we're a bit slow). From the site: "Ted Nelson's ZigZag(tm) is a new way of putting information into computers, kind of a crossing between a database, a filesystem, a personal information manager and many others. And even that isn't sufficient to describe it: it's simply something new... GZigZag is an open-source free software project implementing ZigZag architecture." We've heard noises about this off and on for years but this is a working implementation. Play with this release, work through the users' guide, create some new dimensions... it runs as advertised and while it's still more a cool toy than a functional worldview, there are real applications for it under development now. Wow.