youtube-dl - A small command-line program to download videos.
ClipConverter.cc - ClipConverter.
4k Video Downloader - 4K Video Downloader is a software program that helps people download video files from sites such as Facebook, YouTube and Dailymotion.
OnlineVideoConverter.com - OnlineVideoConverter.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
VidToMP3.com - VidToMP3.