Barely:AnyThing

Libarynth:SutChwon

co2 - streaming media sucks. let's exchange control data!

udo, audiovisual network sniffing

q3apd (quake3 arena server to pd)

wireTAP is a cross-platform interface to real-time network traffic, formerly proctologic

Carnivore is a surveillance tool for data networks.

peep - audio-based network monitoring

oscgroups by ross bencina

also dont miss on checking http://gulli.com