Demoscene
624 executible packer, AA-group, bomb the bomb, CFXweb, GLoP.oRG, Linjection - Your Resource for Multimedia Files, Linux Demo Scene
Music and Audio
MP3, Ardour, EasyTAG Project, Linux box in your car., Linux DJ, Linux Musician, mbux - open source music box, Moe Music
Video
Cable Frequencies for NTL Analogue, KPlayer, a KDE media player based on MPlayer, Linux 3D, LiVES video editor and VJ tool, Slashdot ; MythTV Links Up with Program Guide Prov, The XAnim Home Page, TiVo Runs Linux!, VCR-HOWTO
Art of Illusion
Art of Illusion is a 3D-modeller, renderer and raytracer. It is written in Java and runs on Linux, Solaris, OS X, Windows and probably more.
Cthugha Development Page
"An Oscilloscope On Acid" - Cthugha also lets you save certain visualizations to keystrokes which makes it a great tool for VJs.
GStreamer
GStreamer is a multimedia framework for Linux with that can use plugins.
Ice Sound Manager for IceWM
Ice Sound Manager is a Gtk-based sound events and sound theme manager for IceWM that does not require Gnome.
LINGOT is Not a Guitar-Only Tuner
GPL musical instrument tuner, originally conceived to tune electric guitars
MPlayerXP
MplayerXP is branch of the well-known mplayer which is based on a new, thread-based core. The new core provides better CPU utilization and improves performance of video decoding.
O'Reilly Network: Streaming Media With Linux
An Internet guide to the tools and software you'll need to receive and broadcast streaming media with Linux.
OpenQuicktime
An opensource multimedia library to play, edit and author Apple Quicktime movie files.
PRTSoft - Home of MP3 Splitter
MP3 Splitter takes your large MP3s and breaks them into equal sizes that you specify.