VLC media player is a multimedia player, framework, streamer, and encoder. It can play inputs like files, network streams, DVDs, audio CDs, Blu-Rays, capture devices, and screens. It can play most audio and video codecs and formats (MPEG 1/2/4, H264, VC-1, DivX, WMV, Vorbis, AC3, AAC, MKV, etc.), but can also be used to convert to different formats and/or send streams through the network.
GeeXboX is a standalone media player Linux distribution, similar to MoviX. It's a small bootable CD that allows you to play your favorite video (DivX, XviD, H.264, MPEG 1/2, VCD, DVD, OggMedia, Windows Media, RealMedia, etc.) and audio (MP3, Audio CD, Ogg Vorbis, FLAC, MPC, etc.) files. It also supports networking, and is able to play media from Windows/Samba share, NFS, UPnP A/V Media Servers, RTP/RTSP servers, or SHOUTcast. It supports TV-out, TV tuners, DVB cards, and WiFi cards. It is based on MPlayer, and can be used on any x86, x86_64, or PowerPC computer. It's easy to modify the source to build your own GeeXboX or use an alternative boot method.
XMovie is a multimedia player for high quality Quicktime, MPEG, and DVD movies that supports 6 channel audio. The Quicktime decoder reads OpenDivx, assorted YUV formats, JPEG photo, MJPA, RGB, DV, IMA4, ULAW, Vorbis, and PCM codecs. The MPEG decoder reads MPEG-1 video, MPEG-2 video, MPEG-1 system streams, MPEG-2 system streams, VOB files, IFO files, MP2 and MP3 audio, and AC3 audio.
RealPlayer plays streaming audio and video over the Internet in real-time. It plays RealAudio, RealVideo, MP3, 3GPP Video, Flash, SMIL 2.0, JPEG, GIF, PNG, RealPix, RealText, Ogg Vorbis, and Ogg Theora. It is available for Windows, Macintosh, Pocket PC, Nokia 9200 Series, Nokia 7650, Palm OS 5-based handhelds, Linux, Solaris, and many Unix variants.
Freevo is a Linux application that turns a PC with a TV capture card and/or TV-out into a standalone multimedia jukebox/VCR/PVR/HTPC/DVR/set-top box. It uses MPlayer and other applications to play and record audio and video. It is optimized for use with a TV and remote, but can be used with a monitor and keyboard.
The Helix Player is an audio and video player based on the Helix DNA Client engine. The GTK+ version includes a Mozilla browser plug-in and supports local file playback and streaming over RTSP/RTP and HTTP. It supports video zoom in original, double size, and full screen, and supports: SMIL 2.0, Ogg Vorbis, H.263 video, JPEG, GIF, PNG, and RealPix. The Symbian Series60 version supports local and streaming playback (RTSP, RTP, RDP, HTTP) of MP3, AMR narrow band, AMR wide band, RA8, sipro, RV7, RV8, RV9, RV10, H263+, 3GPP rel5 SMIL 2.0, images, and more.