MPlayer - MPlayer is a movie player which runs on many systems (see the documentation).
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Kaffeine - Kaffeine is a media player for the KDE desktop environment.
Windows Media Player - Get information about Windows Media Player and other Windows Media technologies.
Pretty Good Music Player - Music player that focuses on basics: rock solid music playing.
XULPlayer - XULPlayer is an open-source media player and converter built on Mozilla XUL and MPlayer.