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

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

Invoice Ninja

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

Frappe Books

Modern offline-first accounting software for small businesses

Aureus ERP

Modern open-source ERP built with Laravel and FilamentPHP

IDURAR

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

Crater

Open-source invoicing and expense tracking for businesses