Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Flash Video Downloader - Flash Video Downloader is a popular extension for Google Chrome browser for downloading wide range of files over the internet.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
ClipGrab - A friendly downloader for YouTube and other sites
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
FastestTube - Youtube fastesttube downloader will make your internet expirience faster harder beter stronger.How to merge video and audio .