SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
FamiStudio - FamiStudio is very simple music editor for the Nintendo Entertainment System or Famicom. It is designed to be easier to use than FamiTracker, but its feature set is also much more limited.
foobar2000 - An advanced freeware audio player for the Windows platform.
MOTU Digital Performer - Get inspired, then refine your mix — all in a singular workflow.
Winamp - Winamp is a media player that allows users to play multiple-file formats, arrange media in a varied file-management system, and play unique media with AAC encoding.