Maui (GPL)
###Summary Maui automatically identifies main topics in text documents. Depending on the task, topics are tags, keywords, keyphrases, vocabulary terms, descriptors, index terms or titles of Wikipedia articles.
###Demo You can try out this live Maui demo by just copying and pasting a piece of text of your choice or uploading a document in Word or PDF format.
###Maui performs the following tasks:
- term assignment with a controlled vocabulary (or thesaurus)
- subject indexing
- keyphrase extraction
- terminology extraction
- automatic tagging
- concept extraction
It can also be used for terminology extraction and semi-automatic topic indexing.
Googlecode project contains some (in parts outdated) documentation