I recently started using the MatriX SDK for a web-based chat in ASP.NET. I use it in combination with OpenFire and so far it seems like an excellent SDK that I will most likely buy and keep using.
They also give very good support via their forums. I had a problem with my implementation and they helped me identify the problem and fix it. They respond very fast to my forum posts and give useful information.
Gilian Keulens, Obec Software Engineering B.V.
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