Datadog is a cloud-based monitoring and analytics platform that provides observability and security for cloud-scale applications

Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

Status, performance and uptime monitoring for cron jobs, websites, APIs and more.

Percy is a visual testing and monitoring tool that focuses on detecting visual changes in web applications

Design, debug, and test APIs locally or in the cloud

Selenium automates browsers. That's it! What you do with that power is entirely up to you.