Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Getyt - Getyt.eu is the fastest YouTube to mp3 & mp4 conversion website.
Video DownloadHelper - Browser extension to download videos from the Web
ConvertToAudio - Use ConvertToAudio.com to convert videos from YouTube, Vimeo, Dailymotion, Facebook to MP3, MP4, AAC and more. We are free and super easy to use!
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Freemake Audio Converter - Audio Converter is a free to download file converter tool software developed by Freemake. Freemake has developed many free tools in the past, such as the popular Freemake Video Converter. Read more about Freemake Audio Converter.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.