invoicing

Zero-maintenance invoicing that generates beautiful invoices automatically

Open-source accounting software for small businesses.

Open-source invoicing application for freelancers.

Open-source subscription billing platform.

Open-source metering and usage-based billing.

Open-source invoicing app for freelancers.

Manage Factur-X and ZUGFeRD 2.0 PDF invoices in PHP

Swiss QR Bill generation for Node.js and browsers

Library for creating European-compliant electronic invoices

Simple invoicing REST API — send JSON, get a PDF

Super simple PDF invoicing library for Ruby