As of 2015, some good free video-to-MP3 converters are Any Video Converter Free, HandBrake and CloudConvert.com. Any Video Converter Free is compatible with Windows and Mac OSX. It lets users rip the audio tracks of videos, including online videos, to MP3 format.
HandBrake is an open-source converter that is compatible with Windows, Mac OSX and Ubuntu. It can convert most common video files, including non-copy protected DVD and BluRay videos, into MP3 tracks. CloudConvert.com is an online video converter that supports over 200 formats. Users have the option to save their converted files on cloud storage services, such as Dropbox, Google Drive, OneDrive and Box.