Eduardo Mauro, the developer of Connected Text, has released version 5.0.  Connected Text is  billed as a “Personal Wiki,” and it’s certainly that,  but that description barely does it justice, given its rich internal and add-on features.  I’ve been using it intermittently for about two years, but cannot claim to have mastered all of its features.  However, spend a little time browsing the user forums and you’ll get a sense of how sharp the user population is, and the sorts of challenging intellectual problems to which Connected Text is applied.