FontForge - Free (libre) font editor for Windows, Mac OS X and GNU+Linux
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Glyphs - Make everything from dingbat webfonts to full-fledged text typefaces in the most Mac-like font...
foobar2000 - An advanced freeware audio player for the Windows platform.
FontCreator - This professional font editor allows you to create and edit TrueType and OpenType fonts.
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.