Cydia - An alternative app store for jailbroken devices.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
foobar2000 - An advanced freeware audio player for the Windows platform.
Fnd - Browse Apple App Store and iTunes on the Web
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.