libsvm is the first supervised machine learning library i have used extensively, more than 10 years back.
It was pretty awesome that time back, seeing a 78% text classification accuracy of against more than 100,000 hotel reviews, i have crawled from ctrip.com.
While, at version 3, they are able to achieve 96.875% for text classification results now, as:
lwpro2.wordpress.com 