Software  - 
Free artificial intelligence chat bot by Pandorabots - based on open source and open standards (AIML).  See for example:

Here's a version that works in the browser instead of as an app: http://www.eslfast.com/robot/english_tutor.htm

And here are 1500 practice conversations in English: http://www.eslfast.com/robot/

More about making your own chatbots here: http://www.pandorabots.com/botmaster/en/home and http://alicebot.blogspot.com/
English Tutor is an online language robot created to help English learners ...
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