Your team wants to brainstorm for a project. You want software to facilitate the process. What do you want it to be able to do?
i use www.mindmeister.com and www.trello.com
the big advantage is that you can collaborative work
Sort it into spectra- show the various themes and differences, personal vs social, fact vs fiction, productivity vs raising quality, high-end vs commodity, need vs fad, etc. Being able to find new similarities and attributes would be great, but being able to come up with its own is even better, of course. It might be enough to have canned attributes, time to market, time to 1, 5, 10, 15, 20% of the market. Areas of dominance and/or IP, vs keeping up on features. And either it knows, or you can set, the areas that are different about it. Then A) rank them and create differentiating summaries, and B) be able to select attributes and compare by them so people can analyze. (Wow, that just sort of fell out of my head... Now onto real work!)
MindJet is what we use.