VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
MPlayer - MPlayer is a movie player which runs on many systems (see the documentation).
VPlayer - VPlayer - a free music player for VKontakte.
Kaffeine - Kaffeine is a media player for the KDE desktop environment.
MoboPlayer - MoboPlayer is a video player for Android that plays most video formats.
XULPlayer - XULPlayer is an open-source media player and converter built on Mozilla XUL and MPlayer.