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.
y2mate.tv - Y2Mate YouTube Converter is not just a video converter, but also an audio converter. You can easily convert YouTube videos to the format you want, such as MP4 (320p, 480p, 720, HD 1080p), 320kbps MP3, M4A, WEBM, etc.
Zene Download - Zene is the new app that helps users find free music on Youtube, convert it to mp3 format and download for offline listening. Site is originally in Hungarian language, with English version included
y2mate - Y2mate.
4k Video Downloader - 4K Video Downloader is a software program that helps people download video files from sites such as Facebook, YouTube and Dailymotion.
Keepvid.pro - Download streaming videos online and convert YouTube to Mp3