MatriX XMPP library for iOS and Android is in Beta status now. Both versions are based on MonoTouch and Mono for Android from Xamarin.
Using this technology you can easily port your existing MatriX based c# XMPP apps to iOS and Android and resuse most of your existing code and business logic.
When you are interested in Beta testing then please contact us.
Which server is compatible for MatriX?
XMPP is a standardized protocol within the IETF. MatriX is fully compatible with the latest standard. So it works with every XMPP server that follows the standard. I am no aware of any incompatible servers.