Germany
German open source works around a closed core: the fiscal authority's ERiC library handles actual submission, and open projects wrap it, automate it, or model the rules beside it. That includes Rust bindings for ERiC, MCP servers that give AI agents ELSTER access, GETTSIM's transparent model of the tax-benefit system, ZUGFeRD/XRechnung e-invoicing libraries, and a fine-tuned Steuer-LLM.
A fully open ERiC replacement. Submission to ELSTER still requires the closed-source library, which caps how open any German filing tool can be.
10 projects tagged Germany, ranked by community stars.
Open Source Java e-Invoicing library, validator and tool (Factur-X/ZUGFeRD, UNCEFACT/CII XRechnung)
Python lib for Factur-X, the e-invoicing standard for France and Germany
Create and import e-invoices with ERPNext.
AI-powered bookkeeping and tax filing automation via MCP for entrepreneurs at the heart of the European economy
Libreoffice Extension to generate PDF Factur-X invoices with Libreoffice Calc
Rust bindings and SDK for the ELSTER Rich Client (ERiC)
Model Context Protocol (MCP) server for ELSTER (German tax portal). Submit UStVA, prepare EUER/ESt, sync inbox + history via Puppeteer.
Java library helping you to handle ZUGFeRD invoices