Smilla .NET Communication Library  

NET Framework lacks support of some important Internet protocols, for example NNTP and POP3. Smilla .NET Communication Library is intended to improve the situation. For now, NNTP protocol is implemented, and there are also plans for POP3 and may be some other protocols.

Price: Free

   AyloNNTP  

TCP wrapper class for the Network News Transfer Protocol (NNTP), written in C# for the Microsoft .Net Framework, allows developers to easily add newsreading features to their windows and web applications.

Price: Free

   Rs232  

This class adds serial comunication (Rs232) to your VB.NET applications.

Price: Free

   ProxySocket  

With the ProxySocket class, you can easily add firewall support to your applications. Language: VB.NET

Price: Free