I am currently in the process of carrying out an analysis of the learner-computer interactions that are facilitated by a range of Computer Assisted Learning packages. I want to include examples from as many different categories of Computer Assisted Learning that I can, such as traditional tutorials, drill and practice, intelligent tutoring systems, microworlds, simulations, task support tools, concept formation and articulation tools, hypermedia discovery, and simulation construction.
I have been able to dig up well known examples for most of these categories. However, I have had difficulty laying my hands on examples of Intelligent Tutoring Systems. Some of the literature suggests that there have been very few examples that have found their way into day to day use, despite the large amount of research in the area. Does anyone know of any Intelligent Tutoring Systems that are commercially available and in regular use? Even non-commercial packages (e.g., research prototypes) that run on PC or Macintosh and are available for evaluation would be useful.