LiveReload - LiveReload 2 proudly presents… The Web Developer Wonderland. (a happy land where browsers don't need a Refresh button). CSS edits and image changes apply live. CoffeeScript, SASS, LESS and others just work.
browserling - Live interactive cross-browser testing from your browser.
Browsersync - Browsersync makes your tweaking and testing faster by synchronising file changes and interactions...
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
Browserlink.vim - Live browser editing for Vim. Contribute to jaxbot/browserlink.vim development by creating an account on GitHub.
Browsershots - Browsershots makes screenshots of your web design in different browsers.