VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Habit List - Create good habits and break bad ones with the app that keeps you focused.
foobar2000 - An advanced freeware audio player for the Windows platform.
Momentum - Agile goal and performance management
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.
Habitica - Habitica is a free habit building and productivity application.