While writing the book, I again looked at all the card sorting software tools. Some I discounted at the outset, some I have been using to run a sample sort, looking at how they work and the type of output from them.

Currently examining

• OptimalSort - online service
• WebSort - online commercial service
• Card Sword - Windows application.
• Mind Canvas - This is a research service from Uzanto that contains a method called OpenSort. Great fun interface for the activities. (Note: I edited this description after Rashmi commented, so the comment may not make sense in the new context)
• Card Zort - Windows application
• SynCaps - Windows application. Paper sorting, application for analysis
• xSort - Mac OSX application

Didn't evaluate:

• UZ Card Sorting - Part of a consultancy service.
• uzCardSort - a Mozilla extension. No response from the developer, so I assume nothing is happening.
• CardSort - Windows application. Only allows 18 characters per card, is buggy and the developer is unlikely to continue develop in the near term.
• WebCAT - This is an online tool that uses java on the server. I don't have the technology or the skills to set it up, and the demo is not compelling enough for me to bother getting someone to set it up.
• Socratic Card Sort - this appears to be a service for closed card sorting.
• Classified - This has frequently been included in lists of card sorting tools, but is definitely not. Participants have to select where to put each item in a list. If they do not choose correctly, they get an 'incorrect, please try again' error message. I'm not sure what the intent is, but it is certainly not a card sorting tool.