Totem is the official movie player of the GNOME desktop environment based on xine-lib or GStreamer. It features a playlist, a full-screen mode, seek and volume controls, as well as keyboard navigation.

MPlayer is a movie player which runs on many systems (see the documentation). It plays most MPEG/VOB, AVI, Ogg/OGM, VIVO, ASF/WMA/WMV, QT/MOV/MP4, RealMedia, Matroska, NUT, NuppelVideo, FLI, YUV4MPEG, FILM, RoQ, PVA files, supported by many native, XAnim, and Win32 DLL codecs. You can watch VideoCD,...

xine is a free multimedia player. It plays back CDs, DVDs, and VCDs. It also decodes multimedia files like AVI, MOV, WMV, and MP3 from local disk drives, and displays multimedia streamed over the Internet.

Kaffeine is a full featured Multimedia-Player for KDE. By default it uses xine as backend. Kaffeine is free software distributed under the terms of the GNU General Public Licence.

The infamouse "Movie Player for Linux" in a Mac OS X Binary format.

XMMS is a multimedia player for unix systems. XMMS stands for X MultiMedia System and can play media files such as MP3, MOD's, WAV and others with the use of Input plugins.

KPlayer is a KDE media player based on MPlayer. With KPlayer you can easily play a wide variety of video and audio files and streams using a rich and friendly interface that follows KDE standards.

BMP, or Beep Media Player, is a compact media player that was originally forked from XMMS with the goal of porting XMMS to GTK2 and make use of more modern desktop standards.

VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg,) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.

GNU Gnash is a Flash movie player. Till now it has been possible to play flash movies with proprietary software.