The latest release of PCM Hammer includes a simple data logger.
You still have to edit XML by hand to change what it logs, but the format is pretty simple (nothing like ADX). It comes with a couple of example files, and I'm open to feedback about what those log.
It is effectively limited to standard SAE PIDs right now, but it does support logging values from RAM, which means that as we get operating systems reverse engineered we will be able to log anything we want.
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