Videoripper.me is a free web service that will allows downloading online videos. It supports most common video sites like Youtube, Dailymotion, Vimeo, MySpaceTV etc. You can download videos in different formats it includes flv, mp4, 3gp and mp3 formats.
To download videos simply paste URL of the video in videoripper website and click “Rip” then you will get download link for different formats. For using this service you must allow to run java plugin.