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Open‑source invoicing with unlimited invoices, quotes, and payments; integrates with Stripe, PayPal, and more.
#3 Wave
Full‑featured free accounting suite for freelancers and small businesses, including invoicing, receipt scanning, and bank sync.
Up to 5 customers, unlimited invoices, and multi‑currency support; part of Zoho’s larger business suite.
#5 SlickPie
Cloud‑based invoicing with auto‑data entry, tax calculations, and a simple drag‑and‑drop interface.
Clean UI for creating invoices, tracking time, and basic reporting; integrates with popular payment gateways.
#7 Invoicely
Free plan supports unlimited invoices and clients, multi‑currency, and basic expense tracking.
Create and send invoices directly from your PayPal account; recipients can pay instantly with a PayPal or card.
Free invoicing tool that syncs with Square payments; includes automatic reminders and QR code invoices.
Time‑tracking and invoicing combo; free tier allows one user, unlimited invoices, and basic reporting.
#11 Brightbook
UK‑focused free accounting software with invoicing, expense tracking, and simple financial reports.
#12 GnuCash
Open‑source desktop accounting program that includes invoicing, double‑entry bookkeeping, and multi‑currency support.
#13 Akaunting
Free, online accounting platform with invoicing, expense management, and client portal; self‑hosted or cloud.
#14 Simple Invoices
Lightweight, open‑source invoicing system built with PHP; ideal for small businesses that need a self‑hosted solution.
#15 InvoicePlane
Self‑hosted PHP application for creating quotes, invoices, and recurring billing; fully customizable.
Open‑source ERP with a free invoicing module; includes basic accounting, payment integration, and PDF generation.
Project management + invoicing; free tier offers unlimited invoices, up to 5 users, and time‑tracking.
Free 30‑day trial gives full invoicing capabilities, client portal, and bank reconciliation.
Free tier for businesses with annual revenue under $50k; includes invoicing, expense tracking, and client portal.
Downloadable version you can host on your own server; unlimited invoices, clients, and payments without subscription.
#21 Fakturama
Open‑source invoicing and accounting software for Windows, Linux, and macOS; supports multiple languages and currencies.