Open Source XMPP Implementations?

I am looking for a library of some sort to handle XMPP in Windows Phone 7. The only thing I开发者_Python百科 have seen mentions the Matrix XMPP SDK but this appears to be a commercial product.

Are there are any free XMPP implementations for Windows Phone 7?

agsXMPP SDK is a open source XMPP implementation, which also supports Windows Phone.

Yes, it's dual-licensed, with GPL being the open source license. If you need a implementation using a MIT/Apache style license, I think you're out of luck.