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Open Source Testing & Quality Assurance Tools

A curated collection of the best open source software for verifying that code works, spanning test frameworks and runners, browser and load testing, coverage, mocking, and QA automation..

See also:Automated TestingStars growing over the last 30 daysCloud EmulatorsVisual Testing

Floci

Local AWS emulator with no account, gates, or paid tiers

  • Stars

    Stars growing over the last 30 days27,815

  • Last commit

    11 hours ago

  • License

    MIT
Run AWS services locally in development and CI without an account, quotas, or feature restrictions. MIT licensed, no telemetry.

Open Source Alternative to:

LocalStack

Keploy

Turn production traffic into regression tests, no code changes

  • Stars

    Stars growing over the last 30 days19,103

  • Last commit

    10 hours ago

  • License

    Apache-2.0
Captures real API traffic and dependency calls via eBPF to generate tests and mocks automatically, then replays them in CI to catch regressions before they ship.

Open Source Alternative to:

Postman

MiniStack

Run 60+ AWS services locally, free forever

  • Stars

    Stars growing over the last 30 days5,082

  • Last commit

    17 hours ago

  • License

    MIT
MIT-licensed AWS emulator running 60+ services in a single Docker container. Drop-in replacement for LocalStack with real Postgres, Redis, and Docker containers.

Open Source Alternative to:

LocalStack

Hercules

AI
Open-source testing agent for UI, API, security, accessibility & visual QA

  • Stars

    1,210

  • Last commit

    4 days ago

  • License

    AGPL-3.0
Hercules is the first open-source testing agent, enabling zero-code, zero-maintenance UI, API, security, accessibility, and visual validations.

Open Source Alternative to:

QA Wolf

LostPixel

Visual regression testing made effortless

  • Stars

    1,676

  • Last commit

    6 months ago

  • License

    MIT
Automated visual testing tool that detects UI changes, ensures consistency, and accelerates development workflows.

Open Source Alternative to:

Chromatic

Argos

Visual regression testing for seamless UI development

  • Stars

    Stars growing over the last 30 days656

  • Last commit

    4 days ago

  • License

    MIT
Automate visual testing, catch UI bugs early, and collaborate effortlessly with your team to maintain pixel-perfect interfaces.

Open Source Alternative to:

Chromatic
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