Deploy KillBill on your own server.

Lago is an open-source metered billing and usage-based pricing platform that helps businesses implement complex pricing models with precision and transparency. Built for modern SaaS companies, Lago provides real-time usage tracking, flexible pricing configurations, automated invoicing, and comprehensive billing analytics. Perfect for businesses that need to implement usage-based pricing, hybrid pricing models, or complex billing scenarios with features like prepaid credits, graduated pricing, and multi-dimensional metering.

HeyForm is an open-source form builder platform designed to create, manage, and share forms with ease. It simplifies form creation workflows for businesses, developers, and individuals by offering intuitive UI components and backend management. HeyForm provides robust support for form encryption, session management, and integrations with third-party services like MongoDB and Redis. Its flexible API allows developers to customize and extend functionalities while ensuring data security. HeyForm's clean design and modular architecture make it scalable and adaptable for growing business needs, enabling effective form creation, storage, and analysis.

Invoice Ninja is a powerful, open-source platform for managing invoices, quotes, and payments, specifically designed for freelancers and small businesses. It allows you to automate billing, track payments, and manage expenses effortlessly. With a user-friendly interface and robust feature set, Invoice Ninja supports multi-currency, recurring billing, and various payment gateways, providing a comprehensive invoicing solution.