VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Vinyl Music Player - A fork of Phonograph Music Player that "makes all Pro features free, as they used to be".
RockPlayer - RockPlayer is a video player that supports nearly all formats.
MX Player - Powerful video player with advanced hardware acceleration and subtitle support.
MoboPlayer - MoboPlayer is a video player for Android that plays most video formats.
Emit - Emit can stream from a Windows/Mac/Linux machine to an android/iOS device.