There is an article for free DVD Ripper, you can download them for try.
For me, MakeMKV is the best. I have used it for years to backup my Blu-ray and DVD collection. One flaw in MakeMKV is it can only save movie to MKV format. Though MKV is a high definition video format, but it cannot be accepted by my iPad. So I need purchase another dvd tool called DVDAid to save my DVD to MP4, that works like a charm.
DVD Decrypter is a free product that has been around for quite some time which can create backup disc images of the DVD-Video structure of DVDs. However, DVD Decrypter has three disadvantages that prevents users to choosing it.
1: So far, there is no news announced that it will be updated for installing on Windows 8.
2: It is especially useful for decrypting copy-protected movies.
3. It only can back up DVDs into VOB or other DVD format, not some playable video format like MP4, M4V, AVI, MOV, .etc
Then if you want to copy or rip DVDs to other common video formats on Windows 8, you need to find another program to meet your demands. Here, a more professional DVD Decrypter for Windows 8(Windows 7/XP included) alternative - Brorsoft DVD Ripperis highly recommended to you.