Browsersync is a powerful tool for web developers that allows them to test their website or application across multiple browsers and devices in real-time. It helps to speed up development time by providing features such as automatic CSS injection, Live Reloading, and cross-browser testing. It also allows developers to mirror changes across multiple browsers and devices, previewing their work on multiple screens in real time. Browsersync also provides an easy-to-use dashboard that allows developers to keep track of their website or application's performance.
Ghostlab
Adobe Edge Inspect
DOMScope
Muir
Suspended since November 2015 Edge Reflow (preview), Edge Inspect and Edge Animate are no longer under active development: https://blogs.adobe.com/edge/2015/11/30/update-about-edge-tools-services/