The website, http://www.nltk.org, says mid 2011 in a very vague manner. I would like to start using NLTK however I have done a fair amount of work with Python 3.x and I don
There is a "2and3" branch in the main nltk repo - see https://github.com/nltk/nltk/tree/2and3
It appears to be getting updated regularly, although I haven't tried it myself.