In need of an open source text language translation API

I have read other posts related to this but I haven't got anything concrete.

I am developing an Android app using phonegap which needs some sort of text translation. So I searched google translate API but they are charging price for it. They haven't make it available for testing also.

So I moved to bing translate but not sure whether we can use it for Android or not. If we can use then how can we use it using jQuery. I have searched a lot but not getting any concrete information.

So someone please suggest Is there anyway by which Google can give their translate API for testing

OR

A way to use bing translate API for Android app for just testing purpose

OR

Any open source API which can do this thing for me.

Please explain with some example.