What is your tech stack for testing web applications?

We all know the challenges behind testing web applications. There are several things to take care, manage and learn. Such as: - Tool for automating browsers: selenium (webdriver), cypress, protractor.. - Test runners: Mocha, Junit, Jest.. - Assertion libraries: Chai - Code management - Storing test assets: Such as keeping screenshots, videos, logs, outputs by unique ids to identify by runs. - Test infrastructure: - Self managed: Managing fleet of servers to be able to test on various OSs, managing new and previous browser versions, maintaining shell/batch scripts and lot of other things. - A service: such as saucelabs What tech stack you use?