open-source

The most powerful TypeScript headless CMS

The open-source Firebase alternative

Open-source customer feedback platform

Free invoicing, expenses, and time-tracking for freelancers

Create a real estate website on Rails in minutes

Open source CRM package for Laravel applications

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

The Bluesky AT Protocol SDK for Python developers

Free open-source block-based email template builder

OAuth 2.0 clients for popular providers — lightweight TypeScript