Testing

Applitools.com—Smart visual validation for web, native mobile and desktop apps. Integrates with almost all automation solutions (like Selenium and Karma) and remote runners (Sauce Labs, Browser Stack). free for open source. A free tier for a single user with limited checkpoints per week.
Appetize—Test your Android & iOS apps on this Cloud Based Android Phone/Tablets emulators and iPhone/iPad simulators directly in your browser. Free tier includes 1 concurrent session with 100 minutes usage per month. No limit on app size.
Bird Eats Bug—Report bugs faster (and better). Record your screen with Bird browser extension, it will auto-capture technical data that engineers need to debug. Free tier suitable for small teams.
BugBug - Lightweight test automation tool for web applications. Easy to learn and doesn't require coding. You can run unlimited tests on your own computer for free. For an additional monthly fee, you also get cloud monitoring and CI/CD integration.
lambdatest.com—Manual, visual, screenshot and automated browser testing on selenium and cypress, free for Open Source
browserstack.com—Manual and automated browser testing, free for Open Source
checkbot.io—Browser extension that tests if your website follows 50+ SEO, speed and security best practices. Free tier for smaller websites.
checklyhq.com - Checkly is the API & E2E monitoring platform for the modern stack: programmable, flexible and loving JavaScript. Generous free tier for devs.
crossbrowsertesting.com - Manual, Visual, and Selenium Browser Testing in the cloud - free for Open Source
cypress.io - Fast, easy and reliable testing for anything that runs in a browser. Cypress Test Runner is always free and open source with no restrictions and limitations. Cypress Dashboard is free for open source projects for up to 5 users.
Cypress Recorder by Preflight - Create AI-powered Cypress Tests/POM models on your browser. It's open-source except for the AI part. It's free for 5 test creations each month with Self-healing scripts, Email, and Visual testing.
everystep-automation.com—Records and replays all steps made in a web browser and creates scripts,…free with fewer options
Gremlin—Gremlin's Chaos Engineering tools allow you to safely, securely, and simply inject failure into your systems to find weaknesses before they cause customer-facing issues. Gremlin Free provides access to Shutdown and CPU attacks on up to 5 hosts or containers.
gridlastic.com—Selenium Grid testing with free plan up to 4 simultaneous selenium nodes/10 grid starts/4,000 test minutes/month
katalon.com - Provides a testing platform that can help teams of all sizes at different levels of testing maturity, including Katalon Studio, TestOps (+ Visual Testing free),TestCloud and Katalon Recorder.
loadmill.com - Automatically create API and load tests by analyzing network traffic. Simulate up to 50 concurrent users for up to 60 minutes for free every month.
preflight.com - No-code automated web testing. Record tests on your browser that are resilient to UI changes and run them on Windows machines. Integrate with your CI/CD. The free plan includes 50 test runs per month with video, HTML sessions and more.
percy.io - Add visual testing to any web app, static site, style guide, or component library. Unlimited team members, Demo app and unlimited projects, 5,000 snapshots / month.
saucelabs.com—Cross browser testing, Selenium testing and mobile testing, free for Open Source
snippets.uilicious.com - It's like CodePen, but for cross browser testing. UI-licious lets write tests like user stories, and offers a free platform - UI-licious Snippets - that allows you to run unlimited number of tests on Chrome for free with no sign up requred, for up to 3 minutes per test run. Found a bug? You can simply copy the unique url to your test to show your devs exactly how to reproduce the bug.
testingbot.com—Selenium Browser and Device Testing, free for Open Source
Testspace.com - A Dashboard for publishing automated test results and a Framework for implementing manual tests as code using GitHub. The service is free for Open Source accounts for 450 results per month.
tesults.com—Test results reporting and test case management. Integrates with popular test frameworks. Open Source software developers, individuals, educators, and small teams getting started can request discounted and free offerings beyond basic free project.
websitepulse.com—Various free network and server tools.
qase.io - Test management system for Dev and QA teams. Manage test cases, compose test runs, perform test runs, track defects and measure impact. The free tier includes all core features, with 500Mb available for attachments and up to 3 users.
knapsackpro.com - Speed up your tests with optimal test suite parallelisation on any CI provider. Split Ruby, JavaScript tests on parallel CI nodes to save time. Free plan for up to 10 minutes test files and free unlimited plan for Open Source projects.
webhook.site - Verify webhooks, outbound HTTP requests, or emails with a custom URL. Temporary URL and email address is always free.
Vaadin—Build scalable UIs in Java or TypeScript, and use the integrated tooling, components and design system to iterate faster, design better and simplify the development process. Unlimited Projects with 5 years free maintenance.

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Testing

Applitools.com—Smart visual validation for web, native mobile and desktop apps. Integrates with almost all automation solutions (like Selenium and Karma) and remote runners (Sauce Labs, Browser Stack). free for open source. A free tier for a single user with limited checkpoints per week.

Appetize—Test your Android & iOS apps on this Cloud Based Android Phone/Tablets emulators and iPhone/iPad simulators directly in your browser. Free tier includes 1 concurrent session with 100 minutes usage per month. No limit on app size.

Bird Eats Bug—Report bugs faster (and better). Record your screen with Bird browser extension, it will auto-capture technical data that engineers need to debug. Free tier suitable for small teams.

BugBug - Lightweight test automation tool for web applications. Easy to learn and doesn't require coding. You can run unlimited tests on your own computer for free. For an additional monthly fee, you also get cloud monitoring and CI/CD integration.

lambdatest.com—Manual, visual, screenshot and automated browser testing on selenium and cypress, free for Open Source

browserstack.com—Manual and automated browser testing, free for Open Source

checkbot.io—Browser extension that tests if your website follows 50+ SEO, speed and security best practices. Free tier for smaller websites.

checklyhq.com - Checkly is the API & E2E monitoring platform for the modern stack: programmable, flexible and loving JavaScript. Generous free tier for devs.

crossbrowsertesting.com - Manual, Visual, and Selenium Browser Testing in the cloud - free for Open Source

cypress.io - Fast, easy and reliable testing for anything that runs in a browser. Cypress Test Runner is always free and open source with no restrictions and limitations. Cypress Dashboard is free for open source projects for up to 5 users.

Cypress Recorder by Preflight - Create AI-powered Cypress Tests/POM models on your browser. It's open-source except for the AI part. It's free for 5 test creations each month with Self-healing scripts, Email, and Visual testing.

everystep-automation.com—Records and replays all steps made in a web browser and creates scripts,…free with fewer options

Gremlin—Gremlin's Chaos Engineering tools allow you to safely, securely, and simply inject failure into your systems to find weaknesses before they cause customer-facing issues. Gremlin Free provides access to Shutdown and CPU attacks on up to 5 hosts or containers.

gridlastic.com—Selenium Grid testing with free plan up to 4 simultaneous selenium nodes/10 grid starts/4,000 test minutes/month

katalon.com - Provides a testing platform that can help teams of all sizes at different levels of testing maturity, including Katalon Studio, TestOps (+ Visual Testing free),TestCloud and Katalon Recorder.

loadmill.com - Automatically create API and load tests by analyzing network traffic. Simulate up to 50 concurrent users for up to 60 minutes for free every month.

preflight.com - No-code automated web testing. Record tests on your browser that are resilient to UI changes and run them on Windows machines. Integrate with your CI/CD. The free plan includes 50 test runs per month with video, HTML sessions and more.

percy.io - Add visual testing to any web app, static site, style guide, or component library. Unlimited team members, Demo app and unlimited projects, 5,000 snapshots / month.

saucelabs.com—Cross browser testing, Selenium testing and mobile testing, free for Open Source

snippets.uilicious.com - It's like CodePen, but for cross browser testing. UI-licious lets write tests like user stories, and offers a free platform - UI-licious Snippets - that allows you to run unlimited number of tests on Chrome for free with no sign up requred, for up to 3 minutes per test run. Found a bug? You can simply copy the unique url to your test to show your devs exactly how to reproduce the bug.

testingbot.com—Selenium Browser and Device Testing, free for Open Source

Testspace.com - A Dashboard for publishing automated test results and a Framework for implementing manual tests as code using GitHub. The service is free for Open Source accounts for 450 results per month.

tesults.com—Test results reporting and test case management. Integrates with popular test frameworks. Open Source software developers, individuals, educators, and small teams getting started can request discounted and free offerings beyond basic free project.

websitepulse.com—Various free network and server tools.

qase.io - Test management system for Dev and QA teams. Manage test cases, compose test runs, perform test runs, track defects and measure impact. The free tier includes all core features, with 500Mb available for attachments and up to 3 users.

knapsackpro.com - Speed up your tests with optimal test suite parallelisation on any CI provider. Split Ruby, JavaScript tests on parallel CI nodes to save time. Free plan for up to 10 minutes test files and free unlimited plan for Open Source projects.

webhook.site - Verify webhooks, outbound HTTP requests, or emails with a custom URL. Temporary URL and email address is always free.

Vaadin—Build scalable UIs in Java or TypeScript, and use the integrated tooling, components and design system to iterate faster, design better and simplify the development process. Unlimited Projects with 5 years free maintenance.