ZUGFeRD is a cross-industry data format for electronic invoice data exchange that was developed by the Forum for Electronic Invoicing Germany (FeRD) - with support from the Federal Ministry of Economics and Energy.

Web-based tool by the ZUGFeRD community with OXSEED, Mustang, and XML.Valitool. Validates ZUGFeRD/Factur-X invoices against schema and profile rules for e-invoicing compliance in Germany.

Open-source desktop app and Mustangproject sister project for viewing Factur-X/ZUGFeRD and XRechnung invoices. Displays embedded PDFs with invoice data for easy inspection.

Open-source Java library, validator, and tool for Factur-X/ZUGFeRD and UN/CEFACT CII (XRechnung). Creates, reads, and validates e-invoices against official standards for compliant electronic invoicing.

Graphical user interface for the visualization and validation of XRechnung (and other EN16931-compliant e-invoices), as well as a tool for calculating and checking routing IDs (Leitweg-IDs).

Offline desktop application for visualizing electronic invoices, including CEN invoices and XRechnung 3.0. Uses KOSIT visualization to display invoice data clearly and support compliance checks.