Here are three (click through for the rest):
Tagul - Tagul has some features that Wordle doesn’t, like custom shapes selection and multiple fonts usage in one cloud. It also allows for the use of tagged words that can act as pointers to URL’s if embedded in a web page. It abounds in options but registration may limit classroom use. Requires a log in with email.
Word It Out - Much like Wordle, it creates word clouds out of any text that you paste into the text box. This application allows the word cloud to be customized by size, font, and color scheme. Word It Out also allows the user to ignore certain words and thus keeps them out of the word cloud. Can be used without a login, although the saving option requires an email. Can work around this option by right clicking to save as jpeg and/or screen print.
Tag Crowd - While it does not give the color,unique style, or layout variation of of Wordle, it does allow one to see frequency of words. It also allows a file to be uploaded or a URL address to be used. The word cloud creations can be saved as a PDF files or printed from a full screen print menu. No login or email is required and free use of the product is for nonprofit use listed under creative commons.