台灣電子發票統一 SDK：一套與供應商無關的介面，支援 Amego、ECPay 綠界、ezPay 藍新與財政部平台。Unified e-invoice (電子發票) SDK for Taiwan — one interface, multiple providers.

API REST open source NestJS para facturacion electronica Ecuador SRI. Facturas, NC, ND, Retenciones, Guias de Remision. Firma XAdES-BES, Multi-tenant, BullMQ, Docker.

A Node.js library for creating ZUGFeRD/Factur-X compliant documents. Generating XML and embedding it into PDF/A files, enabling seamless e-invoicing and digital document compliance.

Library for creating electronic invoices in several formats

Facturación Electrónica de Venezuela para la normativa del SENIAT

电子发票合并工具，旨在解决批量处理电子发票的痛点问题。支持批量合并多页 PDF 和图片文件为 A4 双联排版，以及按比例分割 PDF 页面并导出为 PNG 图片。所有处理均在浏览器本地完成，无需安装任何软件，文件不会上传到服务器。

Visualizer for XRechnung

Ruby gem for Taiwan e-invoice (電子發票) operations via Cetustek's InvoiceMultiWeb SOAP API — issue, cancel, and query invoices

PHP SDK for the ECF DGII electronic fiscal receipt API (Dominican Republic)

Java library for creating electronic invoices compliant to the XRechnung standard.

Builder TypeScript per la creazione e validazione di fatture elettroniche XML compatibili con il Sistema di Interscambio (SDI) — formato FatturaPA FPR12/FPA12

Claude Code skill for Taiwan ezPay（簡單行動支付）e-invoice 電子發票 API — issue/void/allowance/query, 字軌, dual-key crypto + verifier｜任何語言皆適用

Genera, firma y exporta facturas electrónicas FacturaE (3.2.x) en PHP 8.2+ — API fluent, firma XAdES-EPES, sellado de tiempo TSA, cero dependencias. La alternativa moderna a facturae-php.