youtube-dl is a command-line utility for downloading videos or extracting audio files from streaming websites such as YouTube, Dailymotion, and Vimeo. Developed by Ricardo Garcia Gonzales
License: Open Source
YouTube-dl is a powerful, open-source command-line tool suitable for advanced users, offering extensive features and support for many websites. In contrast, YTD is a user-friendly GUI application designed for casual users, which simplifies the download process but lacks some of the advanced capabilities of youtube-dl.