Web Starter Kit - a workflow for multi-device websites
...You're free to use either this or a completely clean-slate via basic.html. Minify and concatenate JavaScript, CSS, HTML and images to help keep your pages lean. JavaScript code linting is done using ESLint - a pluggable linter tool for identifying and reporting on patterns in JavaScript. Web Starter Kit uses ESLint with eslint-config-google, which tries to follow the Google JavaScript style guide. A built-in server for previewing your site locally while you develop and iterate. Reload the browser in real-time anytime an edit is made without the need for an extension.
Flat UI KIT based on Bootstrap 3.3.0 CSS framework
...Bootflat is fully responsive, built for mobile-first in mind. It provides off-screen navigation, and almost all the widgets are compatible with all screen sizes. Bootflat UI Kit is PSD User Interface Pack including a set of beautiful and pure components, which you can use to create startup projects, websites or iOS/Android Apps.