Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Ocean beta - Make music with friends in your browser
Video DownloadHelper - Browser extension to download videos from the Web
iO-808 - Rhythm composer modeled after Roland's TR-808 drum machine.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Music Box Fun - Make and share music box songs online
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.