VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Aiseesoft Video Converter Ultimate - Aiseesoft Video Converter Ultimate is professional and powerful video software to enhance video, convert videos/DVDs and videos
AIMP - AIMP : Free Audio Player : Официальный сайт программы
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
foobar2000 - An advanced freeware audio player for the Windows platform.
Vidmore Video Enhancer - Vidmore Video Enhancer provides one-stop solutions for you to enhance video quality, upscale resolution from SD to HD, optimize brightness and contrast, remove noise, reduce shaking and more on your Windows & Mac.