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VLC media player
[1452 users on Ohloh]
VLC - the cross-platform media player and streaming server

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.

[888 users on Ohloh]
MPlayer is a movie player which runs on many systems and plays most known video and audio formats. Another great feature of MPlayer is the wide range of supported output drivers. It has also an onscreen display (OSD) for status information, nice big antialiased shaded subtitles and visual feedback for keyboard controls.
[542 users on Ohloh]
Rediscover Your Music!

Amarok is the music player for Linux and Unix with an intuitive interface. Amarok makes playing the music you love easier than ever before - and looks good doing it.

[451 users on Ohloh]
FFmpeg is a complete solution to record, convert and stream audio and video. It includes libavcodec, the leading audio/video codec library. FFmpeg is developed under Linux, but it can compiled under most operating systems, including Windows.
[250 users on Ohloh]
Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel. This places Vorbis in the same competitive class as audio representations such as MPEG-4 (AAC), and similar to, but higher performance than MP3 and WMA.
[202 users on Ohloh]
Ogg is a multimedia container format, and the native file and stream format for the Xiph.org multimedia codecs. As with all Xiph.org technology is it an open format free for anyone to use.

libogg is the reference library for demultiplexing and mutiplexing files in the ogg multimedia format.

[185 users on Ohloh]
Totem is a media player for the GNOME desktop environment using GStreamer or xine as a backend. It also includes a browser plugin compatible with Windows Media player targeted websites, and has a plugin system itself, allowing C, Python or Vala plugins to extend Totem and add functionality.
[180 users on Ohloh]
GStreamer is a development framework for creating applications like media players, video editors, streaming media broadcasters and so on. It aims to support every format imaginable.
xine - a free video player
[167 users on Ohloh]
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. It interprets many of the most common multimedia formats available--and some of the most uncommon formats, too. All those features come in a reusable library (xine-lib) which can easily be embedded in your applications.
Simple DirectMedia Layer
[136 users on Ohloh]
A cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.

SDL supports Linux, Windows, Windows CE, BeOS, MacOS, Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX, and QNX. The code contains unofficial support for AmigaOS, Dreamcast, Atari, AIX, OSF/Tru64, RISC OS, SymbianOS, and OS/2.

SDL is written in C, but works with C++ natively, and has bindings to several other language...

[107 users on Ohloh]
Music Player Daemon (MPD) allows remote access for playing music (MP3, Ogg Vorbis, FLAC, AAC, Mod, and wave files) and managing playlists. MPD is designed for integrating a computer into a stereo system that provides control for music playback over a local network. It is also makes a great desktop music player, especially if you are a console junkie, like frontend options, or restart X often.
[93 users on Ohloh]
Import, organize, play, and share your music using Banshee's simple, powerful interface.

Rip CDs, play and sync your iPod, create playlists, and burn audio and MP3 CDs. Most portable music devices are supported.

Banshee also has support for podcasting, smart playlists, music recommendations, and much more.

mplayerplug-in for mozilla
[81 users on Ohloh]
mplayerplug-in is a plugin for Mozilla to play videos embedded in a Web page. It uses Mplayer to process the video.
[74 users on Ohloh]
MythTV is a home-brew PVR project. It's been under heavy development for seven years, and is now usable and full featured.
[71 users on Ohloh]
An interface to the ImageMagick and GraphicsMagick image processing libraries. Supports over 100 image formats, including GIF, JPEG, PNG. See rmagick.rubyforge.org for prereqs, install FAQ, more.
[69 users on Ohloh]
VirtualDub is a video capture/processing utility for 32-bit Windows platforms (95/98/ME/NT4/2000/XP), licensed under the GNU General Public License (GPL).
It lacks the editing power of a general-purpose editor such as Adobe Premiere, but is streamlined for fast linear operations over video.
It has batch-processing capabilities for processing large numbers of files and can be extended with third-party video filters. VirtualDub is mainly geared toward processing AV...
[67 users on Ohloh]
Rockbox is an open source replacement firmware for portable music players. It runs on a wide range of different models.
[61 users on Ohloh]
HandBrake is an open-source, GPL-licensed, cross-platform, multithreaded DVD to MPEG-4 converter, available for MacOS X, Linux and Windows.
[58 users on Ohloh]
Kaffeine is full featured Media Player for KDE3. It supports all kinds of local and network media and digital video broadcasting (DVB). At the moment Kaffeine can use xine-lib or GStreamer as backend.
[55 users on Ohloh]
Songbird is an open-source customizable music player that's under active development.

We're working on creating a non-proprietary, cross platform, extensible tool that will help enable new ways to playback, manage, and discover music. There are lots of ways to contribute your time to the project. We'd love your help!

There are several features we're proud of, but we'll be the first to admit that others need ironing out, are experimental, or are just plain missing. There's still a lot...