HCP (Human Communications Protocol)
A protocol for text, audio, and video communication, and it's Java
implimentation (client and server software)
Microsoft Netshow
Yes, that's right - Microsoft Netshow for Linux
This page has been saying "The Microsoft Media Player for UNIX will be
available in a few weeks..." for alot longer than a few weeks, but this
link should take you there when it is finally available.
NetStreamer
"It is another streaming application to be used over 24+ kbit/s setworks,
like LAN's and ISDN."
RealPlayer
Live streaming audio and video player for X
Dialup Utilities
Diald - the Eric Schenk version
Dial on demand daemon for SLIP/PPP connections