Great Downloader easy to use can convert into multiple file formats. Fast and impressive
YouTube Money Calculator - The easiest way to estimate YouTube earning potential
Video DownloadHelper - Browser extension to download videos from the Web
YouTube Revenue Calculator - Discover your true income potential as a YouTuber
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
YouTube Community - A new, simple way to engage with your viewers
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.