Tensorflow, a sophisticated machine learning program that underpins Google Translate, speech recognition, image recognition and many other critical Google services, is now available under an Apache license, one of the least restrictive free/open licenses.
Google says it opened the code because "machine learning is a key ingredient to the innovative products and technologies of the future" and "we hope to create an open standard for exchanging research ideas and putting machine learning in products."
http://boingboing.net/2015/11/10/google-releases-critical-ai-pr.html