VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
ShareTube - Watch YouTube, synced with friends.
foobar2000 - An advanced freeware audio player for the Windows platform.
&chill - Watch YouTube & Twitch videos with people online
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.
PhotoStructure - PhotoStructure is a complete photo and video management application designed for the whole family.