The Mustang project is a java library to read, write and validate Factur-X/ZUGFeRD meta data inside your invoice PDFs. To write files, a provided PDF/A will be combined with generated or provided XML.

Artifacts using Library to Write, Read and Validate E Invoices (Factur X, ZUGFeRD and to A Limited Extend XRechnung/CII). (2)
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Open Source Java e-Invoicing library, validator and tool (Factur-X/ZUGFeRD, UNCEFACT/CII XRechnung)
Last Release on Feb 19, 2026
Mustangproject
Last Release on Jan 10, 2026
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