No integrated cephalometric library. You’ll need to manually measure angles. But it’s 100% free, legal, and HIPAA-compliant if run on a secure local machine.
Searching for a "free download" of Dolphin Imaging Software —a professional medical device used by orthodontists—often leads to a "helpful story" about the importance of using official, secure versions of software in healthcare. Dolphin Imaging Dolphin Imaging Software Free Download