HTTPster (hipster) is a simple development web server. Built with node.js you can install it using NPM. HTTPster allows you to, with one command, start a local web server that serves files from your local directory. Find out more about HTTPster on github.
When creating responsive web designs, testing them can be a chore. Visum is a tool to allow you to load your site and select different device resolutions. Learn more on the Visum site.