Mono.Zeroconf is a cross platform Zero Configuration Networking library
for Mono and .NET. It provides a unified API for performing the most
common zeroconf operations on a variety of platforms and subsystems: all
the operating systems supported by Mono and both the Avahi
and Bonjour/mDNSResponder transports.

WWW: http://www.mono-project.com/Mono.Zeroconf