VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
humit - A social networking app for music sharing and discovery.
foobar2000 - An advanced freeware audio player for the Windows platform.
Cymbal - Music discovery powered by friends
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.
Better Notes - Simple notes app that ties notes together with #hashtags