Card sorting – online editions
Here are couple of sites for doing card sorting interactively and online. Best part is you can invite participants online to contribute and provide their input. This list is provided by the very awesome UX blog Sixrevisions.
OptimalSort

OptimalSort offers a quality card-sorting and usability-testing service for a monthly fee. Create cards and options, and then send a link to the study to chosen participants. Or tweet the link and get random participants who are willing to help you out. The application offers real-time results and graphs, and the interface is sleek and smart.
WebSort

WebSort is another online application with which designers can create card-sorting usability tests and send a link to the public or to chosen participants. It also has a great interface and calculates results and graphs just like OptimalSort. WebSort, however, has a unique drag-and-drop interface to simplify organization.
User Zoom

Pre-organize data into groups and sub-categories. With User Zoom you can have unlimited participants, and there is an option to include your own questions (such as, Why did you choose to place this content here, or Why did you group these items like this?). Tailored questions will get direct answers from participants and help you analyze their thought processes and improve the user experience.
xSort

xSort is an application for Macs that creates a drag-and-drop interface for card sorting that mimics physical cards. It also calculates and presents the results for you to use on screen or print out for future reference.
CardZort

CardZort, a standalone application for Windows, Mac and Linux, offers a simple approach to digital card sorting. Two programs are available: CardZort, the standard drag-and-drop card-sorting application, and CardCluster, which works with CardZort to create a detailed cluster analysis of the results. This lightweight tool is a great free option that gets right to the point of traditional card sorting.
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