DouglasDwyer 

PowerSerializer is a fast, efficient, customizable C# binary serializer that can serialize absolutely anything.

ExtensibleFtp provides a customizable, scalable FTP server implementation in .NET. It comes with a default implementation for anonymous FTP access, and allows for easy addition of new commands, abstract... More information

RoyalXml is a simple, highly customizable XML serializer for .NET. Though it can be configured in almost any way, the default serialization ruleset supports polymorphism, multidimensional arrays, and... More information

Imp.NET is a fast, high-level, object-oriented C# networking library that supports the invocation of remote methods through proxy interface objects.