Video DownloadHelper - Browser extension to download videos from the Web
YoutubeMultiDownloader - Just like its name YouTube Multi Downloader, it is an online website for downloading the videos of downloading without using any video download and accelerator.
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 - A free web application that allows you to download videos
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
ShareTube - Watch YouTube, synced with friends.