List of free browser-test stuff for developerππ½
If you're looking for all programming tools around browser-test (not just free). Check this page List of browser-test Programming Tools

Firelab
Detect bugs before your customers with automated browser testing - Firelab
Tag: testing, browser-test
100 tests

BrowserStack
Instant access to 2000+ browsers and real iOS and Android devices for cross browser testing. Ship apps and websites that work for everyone, every time. Get Free Trial.
Tag: browser-test, testing
Free for open source project detail here
Microsoft Clarity
Clarity is a free user behavior analytics tool that helps you understand how users are interacting with your website through session replays and heatmaps.
Tag: UX, ux-testing, browser-test

LambdaTest
Perform manual or automated cross browser testing on 3000+ browsers online. Deploy and scale faster with the most powerful cross browser testing tool online.
Tag: browser-test, testing
1 parallel test 60 Min/Month Live real time testing 10 Screenshot Tests per month 10 Responsive Test per month Unlimited access to LT Browser 100 Minutes of free 2 parallel web+mobile automation testing 100 lifetime minutes for Native App Testing on Emulators/Simulators Free 2000 screenshots/month of Visual Regression Testing

Selenium
Selenium is a portable framework for testing web applications. Selenium provides a playback tool for authoring functional tests without the need to learn a test scripting language
Tag: testing, quality-assurance, browser-automation, browser-test
create robust browser-based regression automation suites and tests scale and distribute scripts across many environments