Install
clicks is available in Firefox on Ubuntu. [?]
VLC media player
multimedia player and streamer
MPlayer Movie Player
The Ultimate Movie Player For Linux
Amarok MPlayer Plugin for Mozilla
MPlayer-Plugin for Mozilla
Miro Internet TV
GTK+ based RSS video aggregator
Movie Player (Gstreamer)
A simple media player for the GNOME desktop based on GStreamer
Swfdec Flash Player
Tools to play SWF files (Macromedia Flash) on GNOME
Kaffeine Movie Player Totem (xine backend)
A simple media player for the GNOME desktop based on xine
SMPlayer
Audacious
Banshee Media Player
Media Management and Playback application
Elisa Media Center
media center solution - runtime executables
Helix Player
Helix audio and video player
Exaile Music Player
flexible audio player, similar to Amarok, but written in GTK+
Listen Music Player
music player and manager for GNOME
Dragon Player
Simple KDE 4 video player
VideoCut
KPlayer
XMMS2tray