Crediteuren- en debiteurenbeheer

Metering and usage-based billing.

Modern & private time tracking for macOS & Windows. No cloud, no registration, no paywall. Just download and track your work hours 100% offline.

Open business management platform for collaborative, on-demand and sharing economies (ERP/CRM/HRM/ATS/PM).

Client IT documentation, ticketing, invoicing and accounting for MSPs (Managed Service Providers).

Financial accounting and inventory management software for small to medium businesses.

Track work time and print out a summary of your activities on demand.

Open-source Pricing and Billing Infrastructure 🚀 Subscription management, Invoicing, Pricing, Usage-based billing, Cost limiting, Grandfathering, Experiments, Revenue analytics & Actionable insights

Modern CRM software package to manage your company or foundation activity (contacts, suppliers, invoices, orders, stocks, agenda, accounting, ...).

Open Source CRM for Startups and enterprises. Django + SvelteKit · Self-hosted · Multi-tenant · Free forever

Free, open-source, self-hosted ERP and CRM for small businesses: inventory, invoicing, manufacturing, sales, projects, HR and POS. Built on lsFusion.

Self-hosted invoicing without the bloat.

Usage-based pricing and billing for developers 🔓 Cloud or self-hosted ⚙️ No-code UI 💰 Realtime usage metering 🎟 Credits & top-ups 🔑 Control feature access

The user infrastructure platform. You choose the frontend, backend, and database. Hexclave handles everything else.

Hosting and billing automation. Integrates with WHM, CWP, cPanel and HestiaCP. Full API and easily extensible.

Free Open Source ERP CRM Software Accounting Invoicing | Node.Js React

Invoicerr is a freelance-focused invoicing app that lets you create quotes, generate invoices, track payments, and collect secure signatures.

Invoicing for freelancers & small businesses

Subscription billing & payments platform. Have access to real-time analytics and financial reports.

Open source invoicing and quote application.

A Management System for a Health Care Facility. The system includes Registration of patients, Making appointments, Storing patient records, Billing in the pharmacy & Pharmacy stock controlling

💰 Billing & Payments knowledge for cloud platforms

Build Stripe billing without the glue code. Products in code, webhooks handled, billing state in your app.

Free, easy-to-use billing solution for hosting providers with seamless Pterodactyl Panel integration

Manage quotes, invoices, payments and customers for your small business.

Laravel Cashier provides an expressive, fluent interface to Stripe's subscription billing services.

Metering and Billing for AI, API and DevOps. Collect and aggregate millions of usage events in real-time and enable usage-based billing.

Modern Billing & Monetization UI Components Library

Open source C# e-invoicing library. Enables creating and reading ZUGFeRD invoices.

Integrated accounting and ERP system for small and midsize businesses, with double entry accounting, budgeting, invoicing, quotations, projects, orders and inventory management, shipping and more.

Open Source Pricing & Packaging Infrastructure

All AI developers deserve to get paid. Turn your AI prototype into a paid SaaS with open-source infrastructure for usage billing, payments, attribution, affiliates, anti-abuse, and deployment.

Free, source-available accounting: double-entry bookkeeping, invoicing, US payroll, inventory, bank feeds - desktop app with built-in multi-user Server Edition (no Docker needed). A QuickBooks 2003 Pro replacement. No cloud, no caps.

Free Accounting Software

dj-stripe automatically syncs your Stripe Data to your local database as pre-implemented Django Models allowing you to use the Django ORM, in your code, to work with the data making it easier and faster.

Ubilling is an open-source billing system designed for Internet service providers (ISPs). It provides tools for managing subscribers, handling payments and creating detailed reports. Ubilling allows control and monitoring of a wide range of network equipment and can be easily extended with custom functionality.

Android Library for easing Google Play Billing to your apps with support for Subscriptions, Non-Consumable and Consumable Purchases with a beautiful sample app.

Accounting software designed for small businesses and freelancers.

Frontier is an all-in-one user management platform that provides identity, access and billing management to help organizations secure their systems and data. (Open source alternative to Clerk, WorkOS)

go-iap verifies the purchase receipt via AppStore, GooglePlayStore, AmazonAppStore and Huawei HMS.

Cashier Paddle provides an expressive, fluent interface to Paddle's subscription billing services.

Tom microservice toolkit for Stripe customers, subscription plans, email, and notifications.

A complete starter kit that you can use to build and deploy a Next.js SaaS app powered by Paddle Billing.

A Laravel and Filament-powered accounting platform featuring full double-entry accrual accounting, delivering modern automation for professional financial management.

A package to easily integrate your Laravel application with Lemon Squeezy.

Miru | Time Tracking and Invoicing and Employee Benefits. Built using Ruby On Rails and ReactJS

The best pterodactyl client area! :)

Relay-site attributed token usage for DeepSeek Harness — zero config, no credentials

Sell-Your-Saas is an Open Source solution to automate and sell any Web application as a SaaS service. Solution supports the deployment/undeployment of any application, customer dashboard, automatic invoicing and payment (credit card or sepa direct debit), management of a reseller network, security, backup, supervision and more...

🧾 Open-source WHMCS alternative — self-hosted hosting billing & client portal. Laravel 13 + MySQL. Invoicing, domains, SSL, tickets, reseller, multi-language (30 locales), 16 themes. Free & MIT-licensed. Docs: https://docs.pnlcs.com

💳✨ Add usage-based credits to your Rails app

📴 Automating cost control by capping Google Cloud billing

Laravel SaaS starter kit: auth, teams, Stripe billing, and Slate 3 — Composer package for Laravel 12

SDK for growing mobile in-app purchases

Universal crypto-first platform for payments, subscriptions and software license management

💸BiznisBox is the all-in-one business platform that helps you manage your business, from invoicing to contracts, and more

MagnusBilling is a fast, secure, efficient, high availability, VOIP Billing.

:moneybag: International sales tax calculator for Node (offline, but provides optional online VAT number fraud check). Tax rates are kept up-to-date.

:memo: PDF invoice generator

Kill Bill reusable Java components

Collect recurring payments online - subscription payments collection automation

PHP Mikrotik Billing - Voucher management for Mikrotik Hotspot

A full-featured, open-source alternative to Xero and QuickBooks. It is API-first, developer-friendly, and built for teams that want full control over their financial data.

Для национальных платежных систем в Узбекистане

Self-hosted панель учёта расходов на инфраструктуру: автосинк серверов, балансов и платежей через API хостеров. Мультивалютность, прогнозы, Telegram-уведомления.

AI-powered bookkeeping and tax filing automation for entrepreneurs at the heart of the European economy

Official XSD from the Government of Angola for use in SAF-T AO

💸 Calculate estimated monthly costs of Google Cloud Platform products and resources via YAML files and CLI program (Linux, macOS, Windows)

Pure-python ZUGFeRD implementation

Simplifies the use of Google Play Billing Library (v9.0.0). Handles client connection, querying product details, owned purchases, different purchase types, acknowledging purchases, verify purchase signatures etc.

This repo manages the codebase of Laravel Cashier for Chargebee package

A simple GST invoice billing software

Fab-Manager is the FabLab management solution. It provides a comprehensive, web-based, open-source tool to simplify your administrative tasks and your marker's projects.

Kill Bill Administrative UI engine

Kill Bill deployment utilities

Claude Code plugin that picks and implements the right payment method for your app — from your terminal. 42 providers, 136 payment rails, and deterministic validators that block insecure payment code as it is written.

Web hosting (cPanel, Plesk, DirectAdmin, VirtualMin) billing system built on the latest technologies, including Laravel 12, PHP 8.5, Filament 5 and Livewire 4. Alternative to WHMCS or Blesta or HostBill.

Subscription billing for Ethiopian apps.

⚖️ AFIP invoice integration for django.

OpenSource Freeswitch & Kamailio Billing, rating and Routing Software

Notion API记账, billing2Notion|将导出的微信支付宝付款账单再次导入至Notion（注意：没有使用WeChat Pay, Alipay官方API）

A Management System for a Health Care Facility. The system includes Registration of patients, Making appointments, Storing patient records, Billing in the pharmacy & Pharmacy stock controlling

Android SDK for cross-platform in-app purchase and subscription infrastructure, revenue analytics, engagement automation, and integrations

Go library for accessing the RO e-Factura and RO e-Transport APIs.

Subscription Management and Billing System

Open-Source Buchhaltungssoftware für Freiberufler, Selbstständige und Vereine. Offline-first, datenschutzfreundlich, GoBD-konform. Made for Germany 🇩🇪

A highly customisable, open-sourced billing and management software for hosting business written in PHP

Laravel Point of sale with invoice full source code free download pos apps.

Yeti admin interface. Opensource SIP SBC and VOIP billing.

Most Advanced POS, Billing, Inventory & Invoicing Software which can perfectly fit on your WholeSale & Retail Business --- Demo :

A complete payment library for Elixir and Phoenix Framework

A Node.js module for in-App-Purchase for iOS, Android, Amazon and Windows.

Lightweight proxy that routes Anthropic API billing through Claude Code subscriptions. Zero dependencies, ~150 lines.

An out-of-box Django REST framework solution for payment and subscription management using Stripe.

Library for reading and creating European-compliant electronic invoices (EN 16931)

The top usage-based billing providers for AI products.

HiveMind is a project management and ERP application for services organizations. It features project/task management, request tracking, time tracking, expenses, invoices/payments, general ledger, and content management (wiki). HiveMind is based on Moqui Framework, Mantle Business Artifacts, and Simple Screens.

OpenXE - Free Open Source ERP based on Xentral

Online Invoice Management in Ruby On Rails.

Professional Next 14 SaaS Boilerplate to develop your new product in a weekend with a powerful and scalable stack. - Next 14 (FullStack) - Clerk - Tailwind CSS, TypeScript - Prisma

billing验证

Billing and auth system for VPN provider

Desktop invoicing app built with electron. Create Quotes and Invoices. Download PDF or Email directly to your customers.

A comprehensive PHP Library for the Stripe.

⚡️Typographic is a webfont service (and demo) built with Stripe Billing.

A payment processing library for Elixir

Open Source Point of Sale System.

The free billing system hopebilling.com

Flutter iap plugin

Library for Android In-App Billing (Version 3+)

Akpoho Invoicing Software is an open-source software which provides quotation, invoicing, and receipt functionalities for small businesses.

Android In-App Billing SDK for Cafe Bazaar App Store

Rx wrapper for Billing Library with connection management

Fadvisor(FinOps Advisor) is a collection of exporters which collect cloud resource pricing and billing data guided by FinOps, insight cost allocation for containers and kubernetes resource

Open Source SMSC solution with monitoring, billing, SMPP, SS7 and REST API support.

Azure Functions v2 with .NET Core - billing in serverless architecture.

Easy and lean invoicing for small businesses, consultants and freelancers, created using AppGini

:+1: Easy provide pricing plans for Your Laravel 5.4+ Application

An Open Sourced Invoice System developed for anyone who needs to generate out an invoice and manage clients

Links to articles, guides and resources related to software pricing and its implementation.

Premiumer makes removing ads with a single in-app purchase on Android as easy as pie.

Limit the total costs which can be incurred by your Google Cloud Platform account.