Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
MP3Juices - MP3Juices is a free mp3 search engine and tool that allows you to download unlimited mp3 files anywhere around the world.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
MP3Clan - MP3Clan is a popular web-based application that allows you to enjoy and download unlimited audio songs anytime anywhere.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Lidarr - Lidarr is a music collection manager for downloading and organizing music libraries.