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Packet Peeper is a network protocol analyzer (or 'packet sniffer') for Mac OS X. Its features include TCP stream reassembly, privilege separation, simultaneous capture sessions, filters, Python plugins and support for pcap capture files.
ServicemarX allows you to easily discover, bookmark, and share network services. It extends Bonjour (formerly known as Rendezvous) by expanding its scope Internet-wide. ServicemarX also enables Tiger's Wide Area capabilities. (full source in CVS below)
isectd is a middleware daemon that provides many-to-many client-to-server connectivity. Supports multiplexing requests to multiple server processes over IP networks.