VLC is the most popular media player. It is an independent and open source cross-platform multimedia player and framework that displays most multimedia files as well as screens, audio, CDs, VCDs, and various streaming protocols. It supports all formats of video like MKV, MP4, AVI, MOV, Ogg, FLAC, TS, M2TS, Wv, and AAC. Also, you can customize the skin. Available on Windows, Mac OS, Ubuntu, Android, and iOS.
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Developer
VideoLAN

 Official Website
https://www.videolan.org