Inetlab.SMPP is an easy to use .NET library working with SMPP v3.4. This library supports developing both SMPP client and SMPP server applications capable of sending thousands of SMS messages per minute, working in both directions - sending and receiving messages.
Inetlab.MMS.MM7 is a managed C# library designed for a full-featured work with MMS messages via the MM7 protocol. It supports MMS sending within your own application and receiving MMS messages with the ASP.NET HTTP handler, or by means of a built-in small HTTP server. Your application can also play a role of MMSC.