Good C++ Network Library

Are there any good C++ based network libaries you know of? Prefably free, but must be capable of both server/client and peer to peer.

I'm going to check out that efnet or whatever it's called markly recently used for the new gnet. That any good in your opinon?

http://www.rakkarsoft.com/

Certainly looks cool.

You can try TNL (torque network library) as well.

If your doing something not in blitz, you can try TNL. We messed around with it hoping to use it in blitz once, but it can't be run from a DLL.