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Open‑source invoicing platform with unlimited invoices, proposals, and time‑tracking on its free plan.
Full‑featured accounting suite with free invoicing, receipt scanning, and unlimited clients.
#4 Zoho Invoice
Free for up to 5 customers; includes recurring invoices, payment reminders, and multi‑currency support.
#5 Invoicely
Free tier lets you create unlimited invoices, track expenses, and accept online payments.
#6 SlickPie
Cloud‑based invoicing with auto‑data entry, tax calculations, and multi‑currency support.
Create and send professional invoices for free; pay‑per‑transaction fees only when clients pay.
Free invoice creation with built‑in payment processing; integrates with Square POS.
#9 Brightbook
UK‑focused free accounting software with simple invoicing, expense tracking, and reporting.
#10 Simple Invoices
Open‑source PHP invoicing system; lightweight, customizable, and self‑hosted.
#11 InvoicePlane
Self‑hosted open‑source invoicing app with client management, quotes, and PDF generation.
#12 Fakturama
Free, open‑source invoicing and accounting software for small businesses, with multilingual support.
#13 ZipBooks
Free starter plan includes unlimited invoices, basic reporting, and time tracking.
#14 Harvest
Free for one user; offers invoicing, time tracking, and expense logging.
#15 Nutcache
Free tier for a single user; combines invoicing, project management, and time tracking.
#16 Bonsai
Freelancer‑focused free plan with invoicing, contract templates, and payment reminders.
#17 Invoice Simple
Mobile‑first free invoicing app; create, send, and track invoices on iOS/Android.
#18 Akaunting
Open‑source accounting platform with free invoicing, expense tracking, and multi‑currency support.
Free, open‑source ERP; includes a robust invoicing module with customization options.
#20 GnuCash
Desktop accounting software with invoicing capabilities; ideal for freelancers and small firms.
#21 SleekBill
Free online invoicing tool with customizable templates, recurring invoices, and PDF export.