Open Source Finance & Accounting Tools
A curated collection of the best open source tools for managing financial transactions, accounting, and billing.
AI-powered analytics workspace built for investment teams
Stars
72,645Last commit
1 month agoLicense
AGPL-3.0
Connects proprietary, licensed, and public financial data with AI agents in a self-hostable workspace for asset managers, hedge funds, and banks.
Open Source Alternative to:
Open source payment orchestrator for global transactions
Stars
43,573Last commit
40 minutes agoLicense
Apache-2.0
A unified payment infrastructure that connects multiple payment processors through a single API integration, enabling global payment processing
Open Source Alternative to:
Comprehensive business management, tailored for you
Stars
38,855Last commit
10 hours agoLicense
GPL-3.0
Open-source ERP solution offering modules for accounting, inventory, HR, CRM, and more. Customizable and scalable for businesses of all sizes.
Open Source Alternative to:
Streamline your business finances and operations
Stars
14,950Last commit
3 months agoLicense
AGPL-3.0
All-in-one tool for freelancers and small businesses to manage finances, track time, store files, and send invoices efficiently.
Open Source Alternative to:
Your all-in-one marketplace for digital creators and products
Stars
9,651Last commit
22 minutes agoLicense
MIT
A digital marketplace platform where creators can sell digital products, from courses to software, with built-in payment processing and content delivery.
Open Source Alternative to:
Free online accounting for small businesses and freelancers
Stars
10,101Last commit
19 hours agoLicense
Unknown
Self-hostable accounting software covering invoicing, expense tracking, cash flow, and client portals. Free to use, available in 50+ languages.
Open Source Alternative to:
Modern payment infrastructure for digital products and SaaS
Stars
10,232Last commit
59 minutes agoLicense
Apache-2.0
Comprehensive payment solution with built-in tax handling, automated benefits, and seamless integrations for digital product and SaaS businesses.
Open Source Alternative to:
Transform complex usage data into accurate, real-time billing
Stars
10,488Last commit
4 hours agoLicense
AGPL-3.0
Open-source billing system that handles metering, usage-based pricing, and invoicing at scale. Perfect for AI, cloud, and API companies needing flexible monetization.
Open Source Alternative to:
Send invoices, accept payments, manage your business—all free
Stars
10,048Last commit
20 hours agoLicense
Elastic-2.0
Free invoicing software for freelancers and small businesses. Create professional invoices, track expenses, accept online payments, and manage projects without hidden fees.
Open Source Alternative to:
Simplify expense management for businesses of all sizes
Stars
5,016Last commit
16 minutes agoLicense
MIT
Automate expense reporting, reimbursements, and corporate card management with real-time data sync and powerful integrations.
AI-powered embedded AR/AP automation for platforms
Stars
8,341Last commit
2 years agoLicense
AGPL-3.0
Crater offers AI-driven invoicing workflows, payments, and working capital tools to enhance your platform with minimal technical effort.
Open Source Alternative to:
Open source metering and billing infrastructure for any pricing model
Stars
4,749Last commit
7 hours agoLicense
AGPL-3.0
A flexible billing platform that handles usage-based metering, credit management, and subscription billing, giving developers full control over pricing models.
Open Source Alternative to:
Lightweight self-hosted bookkeeping with AI receipt scanning
Stars
5,520Last commit
3 hours agoLicense
MIT
A privacy-first personal finance app with two-level accounts, multi-currency support, AI receipt recognition, and broad data import from formats like GnuCash and Firefly III.
Open Source Alternative to:
Modern desktop accounting made simple and free
Stars
4,928Last commit
6 days agoLicense
AGPL-3.0
A user-friendly desktop accounting software that helps businesses manage invoices, track expenses, and handle bookkeeping with a modern interface.
Open Source Alternative to:
Effortless time tracking for teams and projects
Stars
4,955Last commit
3 hours agoLicense
AGPL-3.0
Open-source time tracking solution for businesses of all sizes. Manage projects, track billable hours, and generate insightful reports.
Open Source Alternative to:
Automate financial processes for smarter business decisions
Stars
3,882Last commit
3 hours agoLicense
AGPL-3.0
Cloud-based accounting software that streamlines bookkeeping, generates intelligent reports, and offers multi-currency support for efficient financial management.
Open Source Alternative to:
Effortlessly split expenses with friends and roommates
Stars
2,907Last commit
11 hours agoLicense
MIT
A user-friendly app for tracking shared expenses, settling debts, and managing group finances with ease and transparency.
Open Source Alternative to:
Stripe payments, usage tracking, and paywalls in 3 functions
Stars
2,663Last commit
25 minutes agoLicense
Apache-2.0
Simplify Stripe integration for AI startups with 3 functions, 0 webhooks. Build pricing plans in 30 minutes with usage tracking, credits, and feature controls.
Open Source Alternative to:
Modern open-source billing platform for hosting businesses
Stars
2,280Last commit
3 days agoLicense
MIT
Automate subscriptions and manage payments with a flexible, open-source billing system designed specifically for hosting providers.
Open Source Alternative to:
Real-time usage metering and billing for AI companies
Stars
2,241Last commit
14 minutes agoLicense
Apache-2.0
Open source billing platform that turns events into revenue with real-time metering, usage limits, and flexible pricing. Integrates with Stripe, CRMs, and payment providers.
Open Source Alternative to:
Cross-system automation and knowledge base for accounting firms
Stars
1,722Last commit
4 months agoLicense
Unknown
Connects client data across tools, automates recurring accounting workflows, and maintains a self-updating knowledge base with human approval controls.
Flexible billing infrastructure for modern SaaS
Stars
1,227Last commit
3 days agoLicense
AGPL-3.0
Open-source pricing and billing platform that helps SaaS companies launch, test, and scale complex billing models with ease. Features metering, invoicing, and real-time data.
Open Source Alternative to:
Open source financial infrastructure for modern businesses
Stars
521Last commit
6 hours agoLicense
MIT
Build custom financial flows and integrate with any provider using Formance's agnostic platform
Open Source Alternative to:
Cut billing costs with open-source subscription management
Stars
230Last commit
6 months agoLicense
AGPL-3.0
Replace expensive billing solutions with open-source software. Automate subscriptions, accept multiple payments including crypto, and gain real-time revenue insights.
Open Source Alternative to:
Automatically discover hidden subscriptions from your inbox
Stars
11Last commit
33 minutes agoLicense
AGPL-3.0
Free subscription tracker that automatically scans your email to find recurring charges. Privacy-focused discovery with complete spending overview and management tools.
Open Source Alternative to:
Sent – Messaging Infrastructure for Developers. One API for SMS, WhatsApp, and RCS across 190+ countries.
Sent
InfluxDB