While re-building a website you would probably like to re-design the way content is grouped together according to user preferences. One thing that is very useful is a card-sorting tool which automatically displays how the users (who is part of a test) groups content. Often, this is done manually, but there are tools around.
I've tried xSort which works fairly well - but I have no other experience from other tools. What is your preferred tool for Card Sorting?
EDIT: The tool asked for is one that supports both open and closed card-sort.