VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Typora - A minimal Markdown reading & writing app.
foobar2000 - An advanced freeware audio player for the Windows platform.
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.
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.
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.