VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Noor - Chat like you're in the office together
foobar2000 - An advanced freeware audio player for the Windows platform.
Commons - Private Clubhouse for your team to collaborate and connect
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.
ZipMessage - ZipMessage replaces live meetings with asynchronous conversations.