Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
FastestTube - Youtube fastesttube downloader will make your internet expirience faster harder beter stronger.How to merge video and audio .
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Flash Video Downloader - Flash Video Downloader is a popular extension for Google Chrome browser for downloading wide range of files over the internet.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Easy Youtube Video Downloader Express - Easy Youtube Video Downloader Express is one of the best YouTube downloading extensions for the Mozilla Firefox that lets the Firefox users to download all type of YouTube videos via the downloader of their favorite web browser.