dppvalidator is the "GDPR compliance engine" for physical products, enforcing the strict digital syntax required for the EU's Digital Product Passport.

FOSS implementation of ISO18975 link resolver

Semantic vocabulary framework for Digital Product Passports — harmonising GS1, EU ESPR, UNTP, and CEN/CENELEC JTC 24 standards. Browsable ontologies at ref.openepcis.io.