Quack Player
A media player that can play a wide range of file types and codecs because of its internal codec library. It plays video and audio files (AVI, WMA, WMV, MPG, MOV, MP3 and more). Features a media library, video color adjusters, snapshot taking within a video, and graphic audio equalizers. Hue, contrast, brightness and saturation adjustments among other features.

By: Hd1988 Labs
Requires: Windows 98/NT/Me/XP/Vista
Price: Free GNU GPL

TuberPlayer
A multiple audio format player for Windows. It supports OGG, MP1, MP2, MP3, MO3, IT, MOD, MTM, S3M, UMX, XM, and WAV. Also loads PLS/ M3U playlists. It uses little of system resources and has a small footprint (400 Kb). User friendly interface and a transport panel.

By: MicroStar
Requires: Windows XP/Vista
Price: Free