I have for a while been looking at how one could use the KL25Z freedom board as a debugger for Freescale mcus (and other arm-based mcus) using open-source tools as documented on this post. One of my students had a look at the FRDM-KL05Z and it can actually be used in exactly the same way with the exact same openocd configuration file.
The CMSIS-DAP firmware for the kl05z board can be found in the quick start package zip that can be downloaded here: