Web/browser-oriented open source machine learning projects?

Question

Applying machine learning techniques, more specifically text mining techniques, in browser environment (mainly Javascript) or as a web application is not a very widely discussed topic.

I want to build my own web application / browser extension that can accomplish certain level of text classification / visualization techniques. I would like to know, if there is any open source projects that apply text mining techniques in web application or even better as browser extensions?

So far, these are the projects/discussions I gathered with days of random searching:

For text mining in web application:

• http://text-processing.com/ with demo (Close source, with limited api)
• uClassify (close source, no info about library base)
  

For machine learning in Javascript:

• Discussion on the possibility about Machine learning in JavaScript. (mainly about saying Node.js is going to change the landscape)
• brain - javascript supervised machine learning
• A demo project with Naive Bayes implemented in Javascript

For web application text mining, the architect that I can think of:

• Python libraries (e.g. NLTK or scikit-learn) + Django
• Java libraries (a lot) + Play! framework
• Even R based + rApache

Answer 1

Some popular machine learning libraries:

Python - PyBrain

Apache - Mahout