Dragon Player
Dragon Player is a free and open source, simple and minimalistic media player for Linux
Totem
Totem is a free and open source, simple movie player for the GNOME desktop
Parole
Parole is a free and open source, modern simple media player for the Xfce graphics environment
ExMplayer
ExMplayer is a free and open source mediaplayer with 3D/2D video playback support, tools like audio converter,media cutter and audio extractor
Glide
Glide is a free and open source, simple and minimalistic media player
Haruna
Haruna – free and open source, simple and configurable video player, MPV GUI
MoonPlayer
MoonPlayer is a free and open source video player for playing and downloading online videos from YouTube, Youku, and iQiyi, as well as local videos
MPlayer
MPlayer – free and open source, cross-platform media player
QMPlay2
QMPlay2 – free and open source, multiplatform video and audio player which can play most formats and codecs
Celluloid
Celluloid – free and open source, simple media player that can play virtually all video and audio formats, GTK+ frontend for mpv