PocketSphinx/CmuSphinx [1] is your best bet. I have combined it with raspberry pi to voice control my TV, Xbox360 and the lights. Its not very accurate, but if

PocketSphinx/CmuSphinx [1] is your best bet. I have combined it with raspberry pi to voice control my TV, Xbox360 and the lights. Its not very accurate, but if you limit it to a small set of keywords, you are going to be fine. [1] http://cmusphinx.sourceforge.net/ http://cmusphinx.sourceforge.net/