Open Source Finance & Accounting Tools

A curated collection of the best free and open source tools for company money, covering bookkeeping, invoicing, payments, subscription billing and market data.

OpenBB

A data integration toolset for finance teams that connects proprietary, licensed and public sources to Python, Excel, AI agents and dashboards.

Alternative to:

Bloomberg Terminal

AI-powered analytics workspace built for investment teams

Stars
74,808
Forks
7,790
Last commit
4 days ago

Hyperswitch

Modular payments infrastructure that routes transactions across more than 120 processors, for teams that want to own their payment stack.

Alternative to:

Dodo Payments

Open source payment orchestrator for global transactions

Stars
45,421

Midday

All-in-one business assistant for freelancers and solo operators, pulling time tracking, receipts, file storage and reporting together.

Alternative to:

FreshBooks

Streamline your business finances and operations

Stars
15,104

Gumroad

The source of Gumroad's web application, a Rails e-commerce platform where creators sell digital products directly to buyers.

Alternative to:

Shopify

Your all-in-one marketplace for digital creators and products

Stars
10,038

Polar

A billing platform for AI products, letting teams meter tokens, agent runs, and compute without building payment infrastructure themselves.

Alternative to:

Creem

Modern payment infrastructure for digital products and SaaS

Stars
10,432

Akaunting

Online accounting software for small businesses and freelancers, self-hosted on ordinary PHP hosting with a modular app store for extensions.

Alternative to:

FreshBooks

Free online accounting for small businesses and freelancers

Stars
10,238

Lago

Open source billing infrastructure that meters usage events, applies pricing and credits, and issues invoices for AI and SaaS products.

Alternative to:

Stripe Billing

Transform complex usage data into accurate, real-time billing

Stars
10,714

Invoice Ninja

Invoicing and payment software for freelancers and small businesses, available hosted or self-hosted with every paid feature in the source.

Alternative to:

FreshBooks

Send invoices, accept payments, manage your business—all free

Stars
10,330

Expensify

The React Native codebase behind the New Expensify app, shipping to web, iOS and Android from one repository.

Alternative to:

Brex

Simplify expense management for businesses of all sizes

Stars
5,079

Crater

Self-hosted invoicing for freelancers and small businesses, covering estimates, expenses and payments across a web app and mobile clients.

Alternative to:

FreshBooks

AI-powered embedded AR/AP automation for platforms

Stars
8,358

Flexprice

Metering and billing infrastructure for AI and SaaS teams running usage-based, credit-based or hybrid pricing without writing it themselves.

Alternative to:

Stripe Billing

Open source metering and billing infrastructure for any pricing model

Stars
6,877

ezBookkeeping

Self-hosted personal finance tracking that runs on a Raspberry Pi or a NAS, with receipt recognition and wide import format support.

Alternative to:

Monarch Money

Lightweight self-hosted bookkeeping with AI receipt scanning

Stars
5,847

Kimai

Time tracking application for freelancers and companies, with invoicing, budgets, exports and reporting across multiple users, timezones and languages.

Alternative to:

Toggl Track

Effortless time tracking for teams and projects

Stars
5,102

Frappe Books

Desktop accounting application for small and medium businesses, with double-entry bookkeeping, invoicing, point of sale and financial reports, working fully offline.

Alternative to:

FreshBooks

Modern desktop accounting made simple and free

Stars
5,005

Bigcapital

Open source accounting and inventory software for small and medium businesses that need double entry books and real financial reports.

Alternative to:

FreshBooks

Automate financial processes for smarter business decisions

Stars
3,969

Spliit

A free shared-expense tracker for friends, roommates and travelers who want to settle up without paying for an account.

Alternative to:

Splitwise

Effortlessly split expenses with friends and roommates

Stars
3,026

Autumn

A billing layer over Stripe that lets developers ship subscriptions, credits and usage-based pricing through three function calls instead of webhooks.

Alternative to:

Stripe Billing

Stripe payments, usage tracking, and paywalls in 3 functions

Stars
2,833

Paymenter

Open-source billing platform for hosting companies, automating subscriptions and service management for providers and their customers without vendor lock-in.

Alternative to:

Blesta

Modern open-source billing platform for hosting businesses

Stars
2,809

OpenMeter

Usage metering and billing infrastructure for AI and API products priced by consumption, prepaid credits or usage limits.

Alternative to:

Stripe Billing

Real-time usage metering and billing for AI companies

Stars
2,411

Meteroid

Billing and pricing infrastructure for SaaS, infrastructure and AI companies, covering metering, subscriptions, quotes and invoicing in one platform.

Alternative to:

Stripe Billing

Flexible billing infrastructure for modern SaaS

Stars
1,347

Formance

A modular platform for building and operating money flows, for engineering teams that need a ledger and payment layer they control.

Alternative to:

Fragment

Open source financial infrastructure for modern businesses

Stars
529

UniBee

Open source subscription billing for SaaS companies that want invoicing, metering and payment management without Chargebee-scale platform costs.

Alternative to:

Stripe Billing

Cut billing costs with open-source subscription management

Stars
233

Suprascribe

Suprascribe reads your mailbox with AI to surface forgotten subscriptions and track renewals, for anyone quietly losing money to recurring charges.

Alternative to:

PocketGuard

Automatically discover hidden subscriptions from your inbox

Stars
11

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Open Source Finance & Accounting Tools

A curated collection of the best free and open source tools for company money, covering bookkeeping, invoicing, payments, subscription billing and market data.

OpenBB

Hyperswitch

Midday

Gumroad

Polar

Akaunting

Lago

Invoice Ninja

Expensify

Crater

Flexprice

ezBookkeeping

Kimai

Frappe Books

Bigcapital

Spliit

Autumn

Paymenter

OpenMeter

Meteroid

Formance

UniBee

Suprascribe

OpenBB

Hyperswitch

Midday

Gumroad

Polar

Akaunting

Lago

Invoice Ninja

Expensify

Crater

Flexprice

ezBookkeeping

Kimai

Frappe Books

Bigcapital

Spliit

Autumn

Paymenter

OpenMeter

Meteroid

Formance

UniBee

Suprascribe

ERPNext