SolidInvoice
A smaller MIT invoicing app.
Free invoicing software, with no per-seat licence
Invoicing and small ERP systems that replace FreshBooks or Zoho Invoice. Read the licence: two popular projects are source-available, and one has not tagged a release since 2022.
Dolibarr
A small-business ERP that includes invoicing. GPL.
Akaunting
Accounting on a Business Source Licence with a tight use grant.
Invoice Ninja
Invoicing on the Elastic License. You may not resell it as a host.
InvoiceShelf
A maintained fork of Crater for invoices and estimates.
Crater
An invoicing app whose last tagged release was March 2022.
Questions owners ask
What is a free invoicing tool a small business can actually run?
SolidInvoice is the highest measured score in this category right now (50). A smaller MIT invoicing app. The score only counts signals we could verify.
Does “no licence cost” mean the software is finished and supported?
No. It means you are not paying a vendor per seat or per contact for the right to use it. You still pay for a server, email delivery, or someone’s time. Archived and source-available projects are marked.
Are SeatLess apps placed first?
No. SeatLess apps are scored on the same rules and sorted by the measured score. They have no public repository, so GitHub health points are omitted and they do not float to the top.
Related: CRM. E-signature.