Sigil - Sigil is a multi-platform WYSIWYG ebook editor. It is designed to edit books in ePub format.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Vellum - Free beautiful hand-curated wallpapers for the iPhone
foobar2000 - An advanced freeware audio player for the Windows platform.
Pressbooks - Create books: print and ebooks
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.