Ghostlab
Ghostlab allows you to test out a newly developed website on a variety of browsers and mobile devices at the same time. To get started, simply drag the web address to the Ghostlab system and press the play button. Read more about Ghostlab.
22 Alternatives To Ghostlab
Adobe Edge Inspect CC
Here you can access, view, and share creative files saved in Adobe Creative Cloud from virtually any internet-connected device.

Blisk
Download Blisk - a browser for web developers. Blisk is a toolbox for development, debugging and testing: emulation, sync, analytics, and screenshots.
BrowserStack
Test your website for cross browser compatibility on real browsers. Instant access to multiple desktop and mobile browsers. Get Free Trial.
Browsersync
Browsersync makes your tweaking and testing faster by synchronising file changes and interactions…
CSS refresh
CSSrefresh is a small, unobstructive javascript file that monitors the CSS-files included in your webpage. As soon as you save a CSS-file, the changes are directly implemented, without having to refresh your browser.
CasperJS
CasperJS is a browser navigation scripting & testing utility written in Javascript for PhantomJS or SlimerJS.

CrossBrowserTesting
Browser Testing made simple! Run automated, visual, and manual tests on 1500+ real browsers and mobile devices. Test more browsers, in less time.
Endtest
Codeless Automated Testing, Powered By Machine Learning.
GeoScreenshot
Test your website from anywhere in the world. Check availability, website consistency, geo-specific targeting, localization, location-based redirects, performance.
GoRails
Ruby on Rails screencasts for Web Developers

LT Browser
LT Browser is an award winning Next-gen browser to build, test & debug mobile websites. With LT Browser, you can see mobile view of website on different screen sizes and resolution.

Phantomjs
PhantomJS is a headless browser that works hand in hand with Selenium to help developers more efficiently test their sites and apps.
Reloadr
Makes a local site you’re working on automatically reload when specified files are saved. - dbergey/Reloadr

Sauce Labs
Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
Selenium
Selenium automates browsers. That’s it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.
Spotbot
Automatically catch visual website bugs. Spotbot takes screenshots of your web page with iOS, Android, and desktop browsers. When it finds issues, it pings you in Slack. Enter a URL to get started.
Swift Playgrounds
Learn serious code on your iPad in a seriously fun way
TestingBot
Automated and Manual Browser and Device testing.
TestingWhiz
TestingWhiz is a codeless test automation tool for software, mobile and web.

browserling
Live interactive cross-browser testing from your browser.