Foobar will convert DTS CD's to wav or flac just click on convert. You need the DTS decoder installed foo_input_dts.DTS-CDs are "just" Redbook CDs. You can rip them like regular CDs using a computer optical drive. However, to play them back, you will need a DTS decoder. Otherwise, all you will hear is (very loud) noise. I'm sure that there is a software decoder that will do this offline, so that you can save the files as decoded multichannel WAV or FLAC. Note that this won't recover the data lost during the lossy DTS encoding process, so while the resulting decoded files are "lossless" by type, they are not truly lossless. There may also be software that will convert the DTS-encoded Redbook 16-bit/44.1kHz stereo audio to native 20- or 16-bit/44.1kHz DTS files (".dts" file extension). The player foobar2000 was mentioned above; I'm not sure if it (via plugins) will do either, or simply decode the DTS on playback.
The only discs these Blu-ray players will rip are SACDs. For everything else, you need a compatible computer optical drive.
DTS CD's are 20 bit so if you leave the the bit depth setting at auto if will produce a 16 bit file (bit depth of a regular CD is 16 bit). You can change it to 24 bit (there is no 20 bit setting) if you want to capture the full resolution possible from the disc.