Great Downloader easy to use can convert into multiple file formats. Fast and impressive
fre:ac - fre:ac is a audio converter and CD extractor designed for Microsoft Windows, Mac OS and Linux, distributed under the GNU General Public License.
Video DownloadHelper - Browser extension to download videos from the Web
File Converter - Convert & compress everything in 2 clicks!
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Format Factory - Format Factory is software that allows the user to convert media into various file formats. The software is a product of PC Free Time, a Chinese software development company. Read more about Format Factory.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.