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1.Library to Write, Read and Validate E Invoices (Factur X, ZUGFeRD, Order X, XRechnung/CII)7 usages

org.mustangproject » library Apache

FOSS Java library to read, write and validate european electronic invoices and orders in the UN/CEFACT Cross Industry Invoice based formats Factur-X/ZUGFeRD, XRechnung and Order-X in your invoice PDFs.
Last Release on Aug 6, 2026

2.Library to Validate E Invoices (ZUGFeRD, Factur X and Xrechnung)3 usages

org.mustangproject » validator Apache

Library to Validate E Invoices (ZUGFeRD, Factur X and Xrechnung)
Last Release on Aug 6, 2026

3.E Invoices Commandline Tool, Allowing to Create(embed), Split and Validate Factur X/ZUGFeRD Files. Validation Should Also Work For XRechnung/CII.

org.mustangproject » Mustang-CLI Apache

E Invoices Commandline Tool, Allowing to Create(embed), Split and Validate Factur X/ZUGFeRD Files. Validation Should Also Work For XRechnung/CII.
Last Release on Aug 5, 2026

4.Mustang

org.mustangproject » core Apache

Mustangproject is a java library and commandline tool to read, validate, write and convert EN16931 e-invoices, e.g. Factur-X and XRechnung (read and writing CII and reading also UBL).
Last Release on Aug 6, 2026