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  1. 4 open source invoicing tools for small businesses

  2. InvoicePlane - An Open Source Invoicing Application

  3. GitHub - crater-invoice/crater: Open Source Invoicing Solution …

  4. 19 Free open-source self-hosted Invoicing and billing solutions

  5. 11 Best Open Source Invoicing and Billing Software

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  7. SolidInvoice/SolidInvoice: Simple and elegant invoicing solution. - GitHub

  8. SolidInvoice - Simple and elegant invoicing solution

  9. A self-hosted open source application for managing your invoices ...

  10. Free Open Source Invoice Software - GoCardless

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