iTunes is a free application for Mac and PC. It plays all type of your digital music and video.
                                         
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RealPlayer is also known as best media player all the time .The most authentic plugin of real player is oppourtunity to download playing video.

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VLC media player (informally just VLC) is a highly portable free and open-source cross-platform media player and streaming media server written by the VideoLAN project.
VLC media player supports many audio and video compression methods and file formats, including DVD-Video, video CD and streaming protocols. It is able to stream over computer network and to transcode multimedia file.
The default distribution of VLC includes a large number of free decoding and encoding libraries, avoiding the need for finding/calibrating proprietary plugins. Many of VLC's codecs are provided by the libavcodec library from the FFmpeg project, but it uses mainly its own muxer and demuxers and its own protocols. It also gained distinction as the first player to support playback of encrypted DVDs on Linux and OS X by using the libdvdcss DVD decryption library.

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