Great Downloader easy to use can convert into multiple file formats. Fast and impressive
TapTunes - With TapTunes, you will experience your music collection like never before.
Video DownloadHelper - Browser extension to download videos from the Web
Music Player Daemon - Music Player Daemon is a flexible, powerful, server-side application for playing music.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
MakeMePulse - Amazing audio visual experiment.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.