Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
y2mate - Y2mate.
Video DownloadHelper - Browser extension to download videos from the Web
Savemp3.cc - An online free YouTube converter which allows you to convert videos and audios to MP4, MP3, M4A from YouTube, Facebook, Instagram, MixCloud, Dailymotion, VEVO, bilibili, niconico, etc. Supports HD MP4, 720p, 1080p video and 320kbps MP3.
4k Video Downloader - 4K Video Downloader is a software program that helps people download video files from sites such as Facebook, YouTube and Dailymotion.
YTMP3.co.com - YTMP3.co.com is a 100% free multi-format audio and video downloader that lets you convert video and audio from most social media platforms. No annoying ads.