Exchange 2007/2010/2013 Calendar, Tasks, Contacts and GAL Provider.
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Sharp.Xmpp is a multiplatform, Windows and Android, .NET XMPP client assembly. Sharp.Xmpp supports IM functionality & a variety of XMPP extensions, is simple and is extensively tested against Android Xamarin. It is a fork of the currently frozen excellent S22.Xmpp project.
The php WhatsApp library
WhatsApp Registration Tool
A .NET WhatsApp API