Are there any mature P2P frameworks/libraries in C#? [closed]

Answer 1

Take a look at this link:

Brunet: a remarkably great P2P library

Brunet is a Free Software (GPL licensed) library for P2P networking written in C# and developed using Mono, but it also runs on Microsoft’s .Net platform.

Answer 2

Have you looked into the Peer-to-Peer capabilities in the Windows Communication Foundation (WCF)?