Best Open-source Accounting & Invoicing tools

FOSSBilling

Open-source billing and client management for hosting businesses

metasfresh

Responsive Open Source ERP with Modern Web Interface

Invoice Ninja

Source-available invoicing and time-tracking app built with Laravel

Aureus ERP

Modern open-source ERP built with Laravel and FilamentPHP

InvoicePlane

Self-hosted invoicing platform for managing clients and payments

Akaunting

Modern online accounting software for small businesses and freelancers

Bigcapital

Smart accounting and inventory software for small businesses

Frappe Books

Modern offline-first accounting software for small businesses

IDURAR

Full‑stack ERP & CRM with invoicing, quotes, and accounting

Crater

Open-source invoicing and expense tracking for businesses