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Top Open Source Payment Infrastructure Tools in 2026

A curated collection of the 6 best free and open-source Payment Infrastructure tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.

  • Formance

    Build custom financial flows and integrate with any provider using Formance's agnostic platform

    Stars
    519
    Last commit
    1mo ago
    License
    Open Source

  • Lago

    Open-source billing infrastructure for AI and tech businesses

    Stars
    10,418
    Last commit
    11d ago
    License
    AGPL-3.0

  • Polar

    Billing platform for AI-era software with global tax handling

    Stars
    10,213
    Last commit
    10d ago
    License
    Apache-2.0

  • Paymenter

    Open-source billing platform for hosting businesses

    Stars
    2,268
    Last commit
    10d ago
    License
    MIT

  • Hyperswitch

    A unified payment infrastructure that connects multiple payment processors through a single API integration, enabling global payment processing

    Stars
    43,538
    Last commit
    10d ago
    License
    Apache-2.0

  • Gumroad

    A digital marketplace platform where creators can sell digital products, from courses to software, with built-in payment processing and content delivery.

    Stars
    9,622
    Last commit
    10d ago
    License
    MIT
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Showing 6 of 6 open-source tools