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Open Source Invoicing & Payment Tools using PHPUnit

A curated collection of the best open source tools for creating invoices and processing payments. using PHPUnit.

Akaunting

Free online accounting for small businesses and freelancers

  • Stars

    10,202

  • Last commit

    14 days ago

  • License

    Unknown
Self-hostable accounting software covering invoicing, expense tracking, cash flow, and client portals. Free to use, available in 50+ languages.

Open Source Alternative to:

Quickbooks

Invoice Ninja

Send invoices, accept payments, manage your business—all free

  • Stars

    10,311

  • Last commit

    11 hours ago

  • License

    Elastic-2.0
Free invoicing software for freelancers and small businesses. Create professional invoices, track expenses, accept online payments, and manage projects without hidden fees.

Open Source Alternative to:

Quickbooks

Crater

AI-powered embedded AR/AP automation for platforms

  • Stars

    8,352

  • Last commit

    2 years ago

  • License

    AGPL-3.0
Crater offers AI-driven invoicing workflows, payments, and working capital tools to enhance your platform with minimal technical effort.

Open Source Alternative to:

Quickbooks
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