http://www.cs.berkeley.edu/~dawnsong/papers/2012%20On%20the%...
There's a lot of public work on the topic, but it looks like right now the best place to look is still in academic papers (I don't know of any open source libraries, for example).
I was a close friend of Emil for a long time. Before he passed, I had gotten busy with work and hadn't spoken to him in a while. I saw some of our mutual friends the weekend before it happened and had planned to call him. Really wish I had made that call sooner.
"JGAAP is intended to tackle two different problems, firstly to allow people unfamiliar with machine learning and quantitative analysis the ability to use cutting edge techniques on their text based stylometry / textometry problems, and secondly to act as a framework for testing and comparing the effectiveness of different analytic techniques' performance on text analysis quickly and easily."
[1]: http://evllabs.com/jgaap/w/
Looks like there are some other recommendations at http://evllabs.com/jgaap/w/index.php/FAQ#What_other_tools_ar...
I'm surprised there isn't any open source effort in this area yet (I couldn't find any either). It's just as important as TOR and other anonymity services, since it affects not just passively consuming information, but actively creating it.