MPLAY Multimedia Player is a shareware multimedia player for the Macintosh that supports a wide range of media formats. Originally designed as an easy to use MP3 player, MPLAY has grown to also become a MP3 mixer, an audio/midi player, a videoplayer and an image viewer (with support for fullscreen slideshows). Also, free tools are available for different tasks, including MP3 to AIFF-conversions and much more!
MPLAY is stuffed with useful special features, some of them not found in any other MP3-player or movieplayer:
Audio Track Mixer [more info]
VideoCD-support (req. MPLAY 1.7.1 or later)
Built-in ID3-tag Editor [more info]
Fullscreen modes (audio/video/images) [more info]
MPLAY Tools to extend functionality [more info]
Image slideshows