lontivero 

Open.NAT is a lightweight and easy-to-use class library to allow port forwarding in NAT devices (Network Address Translator) that support Universal Plug and Play (UPNP) and/or Port Mapping Protocol (PMP).

A simple and easy-to-use .NET managed wrapper for Low Level Keyboard hooking.

Peer2Net is a lightweight and easy-to-use class library to develop peer-to-peer applications in .NET and Mono.