K3B can rip DVDs. However, doing this violates the DMCA here in the USA. There are a few dependencies you need to load, and then adjust the configure script in the slackbuild to allow this functionality.
However, there are a few better tools, such as:
which allow better control of the ripping process (copy to iso, transcode, resize, etc)
slackbuilds.org has slackbuild build scripts.