What video downloader should I use?

I don’t even know if I am saying that (“video downloader”) right, but I could use some help here. Recently I downloaded a program for my MP3 player. It came with an internet video downloading tool. It replaced my existing Real Player. I didn’t like it so I disabled it. Now, I don’t have (or I don’t know how to re-enable Real Player) a downloading tool for video.

Does the Fluther have any suggestions as to a free video downloading program I should try or use?