Open Source Billing Software
Billing software helps businesses calculate charges, issue invoices, collect payments, and keep records of customer accounts. It can support recurring subscriptions, one-time purchases, or charges based on measured usage. Automating these tasks reduces manual bookkeeping and helps ensure customers are billed consistently, while giving businesses a clearer view of revenue and outstanding balances.
Open source billing tools range from invoicing and client management systems to platforms for subscription plans, payment workflows, and usage metering. When choosing one, consider its license, maintenance activity, data export options, security practices, and compatibility with your payment providers and accounting systems. Check whether its deployment requirements and pricing model fit your operations. These tools can be useful for freelancers, small businesses, hosting providers, and software companies that want control over billing workflows.
4 repositories · updated October 3, 2026
Rachoon: A Self-Hostable Solution for Invoice Management
Rachoon is a modern, self-hosted invoicing platform designed for freelancers and small businesses. It offers a comprehensive suite of tools to effortlessly create, track, and manage invoices, providing users with full control over their billing processes. With features like client management, payment tracking, and customizable templates, Rachoon simplifies financial administration.
Lago: Open-Source Billing Platform for Usage-Based and Subscription Models
Lago is an open-source, AI-native billing platform designed for usage-based, subscription-based, and hybrid pricing models. It provides comprehensive infrastructure for metering, billing, and revenue management, enabling product-led companies to track and bill for any consumption. With its API-first approach and flexible deployment options, Lago offers a robust solution for modern billing needs.
FOSSBilling: Free and Open-Source Billing and Client Management System
FOSSBilling is a free, open-source billing and client management system designed to automate invoicing, payments, and client communication for online service businesses. It is particularly popular with web hosting providers but also supports software licensing, digital downloads, and subscription services. This project offers an extensible architecture and a security-focused, responsive user interface.
openmeter: Meter Usage and Bill Usage-Based Products
OpenMeter turns high-volume product events into real-time usage data, access limits, and usage-based billing. It suits teams building AI, API, or other metered products that need composable monetization infrastructure they can run themselves.