Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Listenbox - Podcasts from audio & video on the web
Video DownloadHelper - Browser extension to download videos from the Web
Audioship - Upload audio to YouTube or Facebook
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
TunesToTube - What does TunesToTube do?
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.