DVDShrink is certainly free, you can download it here: http://www.videohelp.com/tools/DVD_Shrink Use the direct link.
But Shrink is very much outdated as a decryption program, and was never one that could be used on Mac operating systems.
Ripping dvds on Macs is always problematic, since the decryption programs always seem to lag far behind the new protection schemes as they appear. One of the better known ones is MactheRipper, but to get the latest one, you have to join their forum and "donate".
Handbrake can rip and convert for your iphone, but it also needs to have VLC installed. This is the only free option I know of for Mac operating systems. It will only work on dvds with simple CSS protection, so this will fail on a lot of newer movies. You can find both Handbrake and VLC through a simple Google search.
If you have a modern system and can run a Windows operating system on your Mac via Boot Camp, Parallels Desktop or VMWare Fusion you should be able to use any of the Windows based ripping programs like AnyDVD or DVDFab. Also requires a legal copy of Windows to install.