BMPX is an experimental multimedia player which is extremely easy to use, including many features such as streaming podcasts, last.fm support, online radio stations, audio cd/artist info and lyrics retrieval, and much more.
VLC is the VideoLAN project's media player. It plays MPEG, MPEG2, MPEG4, DivX, MOV, WMV, QuickTime, mp3, Ogg/Vorbis files, DVDs, VCDs, and multimedia streams from various network sources. VLC can also be used as a streaming server that duplicates the stream it reads and multicasts them through the network to other clients, or serves them through HTTP.
Cinelerra is a video/audio editing and creation application similar to commercial proprietray programs used in the movie industry. Cinelerra does primarily 3 main things: capturing, compositing, and editing audio and video with sample level accuracy. If you want to make movies, you just want to defy the establishment, you want the same kind of compositing and editing suite that the big boys use, then it's time for Cinelerra.
A simple and very easy to use CD/DVD burning application for the Gnome desktop, great for burning audio cds, data cds, and data dvds. You burn or copy a video DVD you will need to first create an iso out of the desired media.
Exaile is a media player aiming to be similar to KDE's Amarok, but for GTK+. It incorporates many of the cool things from Amarok (and other media players) like automatic fetching of album art, handling of large libraries, lyrics fetching, artist/album information via Wikipedia, last.fm support, optional iPod support.
Audacious is a fast and lightweight music player which is an evolutionary clone of the Beep Media Player, XMMS, and the classic WinAmp. Supports most all audio formats, play lists, last.fm plug-ins, and any theme designed for it's predecessors.
PiTiVi allows users to easily edit audio/video projects based on the GStreamer framework. PiTIVi provides several ways of creating and modifying a timeline. Ranging from a simple synopsis view (a-la iMovie) to the full-blown editing view (aka Complex View) which puts you in complete control of your editing.
MPlayer can handle most mpeg, avi and asf files, supported by many native and win32 DLL codecs. You can watch VCD, DVD and even DivX movies. Also features a wide range of supported output drivers. It works with X11, Xv, DGA, OpenGL, SVGAlib, fbdev, but you can use SDL and some low-level card-specific drivers, too!
Banshee is an audio management and playback application for the GNOME Desktop, allowing users to import audio from CDs, search their library, create playlists of selections of their library, sync music to/from iPods, and burn selections to a CD.