CodeCanyon - Automatic Text Rewriter v1.1 | 4,25 MB
Automatic Text Rewriter is a lightweight, but powerful, synonym finding script. You input a sentence and it will replace all the words in the sentence with synonyms. It comes complete with a database of over 100,000 words and a pre-built synonym-finding website ready to use. For more PHP savvy users, you can use a simple function to find dozens of synonyms for a word or sentence.
DEMO:
http://codecanyon.net/item/automatic-text-rewriter/2081179