peppol

Self-hosted time tracking & invoicing for freelancers and teams: timers, projects, PDF and Peppol e-invoicing. Open-source Toggl/Clockify alternative.

phase4 - AS4 client and server for integration into existing systems. Specific support for Peppol and CEF eDelivery built-in.

phoss SMP - a Peppol and OASIS BDXR SMP Server; EC eDelivery compliant

Library for reading and creating European-compliant electronic invoices (EN 16931)

Graphische Benutzeroberfläche für die Visualisierung und Validierung von XRechnung (und anderen EN16931-konformen E-Rechnungen) sowie ein Tool für die Berechnung und Prüfung von Leitweg-IDs. || Engl.: Graphical User Interface for visualization and validation of XRechnung (and other EN16931 compliant e-invoices) as well as tool for Leitweg-ID cal…

Oxalis - PEPPOL Access Point open-source implementation.

A modern object-oriented PHP library to read and create valid UBL and Peppol BIS files

A curated list of open source software for Europe — institutions, regulations, standards, and cross-border infrastructure

Generic business document validation engine

eInvoice Validation rules for the phive engine - for many different countries and jurisdictions

Oxalis-NG (Oxalis - Next Generation) - Open-Source implementation of OpenPeppol AS4 profile

Java library with shared Peppol components - identifier handling, codelists, SBDH handler, SMP Client, SML Client, MLR handler, MLS handler

The open source Peppol API you'll actually enjoy using.

The official Peppol Directory software

API first ERP system designed for organisations of all sizes

Sub-millisecond dynamic PDF/A document engine powered by Typst. Replaces Headless Chrome, Puppeteer & Gotenberg with 96% less memory. Native HTTP sidecar.

A JavaScript library for creating and parsing electronic invoices compliant with the eInvoicing Directive, EN 16931, and popular extensions

Extensible PHP library for creating, reading and validating electronic invoices such as XRechnung, ZUGFeRD and Factur-X, with support for custom formats.

Scribo — free, AI-native EN 16931-compliant e-invoicing. ZUGFeRD/XRechnung (Germany) and US plain PDF live; Factur-X, Facturae, Peppol BIS UBL coming soon. Available as MCP server, Claude/Codex skill, CLI, HTTP API, and web app.

Peppol and Oxalis supporting library