VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
wnr - Better than pomodoro, this timer app balances work and rest.
foobar2000 - An advanced freeware audio player for the Windows platform.
Smart Sloth - Smart Sloth uses the concept of timeboxing, which is to allocate a set amount of time to each task, therefore, creating a deadline which can increase the productivity of the user.
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.
ChirpyTime - ChirpyTime: Timer / Alarm Clock / Clock app for iPhone / iPod Touch