Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Devhints - TL;DR for developer documentation
foobar2000 - An advanced freeware audio player for the Windows platform.
Meta Tag Generator - Generate HTML code optimal for SEO, social media, & mobile.
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.