Bootstrap 0 votes

Simple and flexible HTML, CSS, and Javascript for popular user interface components and interactions.

Bootstrap is a toolkit from Twitter designed to kickstart development of webapps and sites.
It includes base CSS and HTML for typography, forms, buttons, tables, grids, navigation, and more.

Bootstrap is built with Less and was designed to work out of the gate with modern browsers in mind.

Bootstrap is tested and supported in major modern browsers like Chrome, Safari, Internet Explorer, and Firefox.

Bootstrap comes complete with compiled CSS, uncompiled, and example templates.

Zen Coding 0 votes

Set of plugins for HTML and CSS hi-speed coding

Zen Coding is an editor plugin for high-speed HTML, XML, XSL (or any other structured code format) coding and editing. The core of this plugin is a powerful abbreviation engine which allows you to expand expressions—similar to CSS selectors—into HTML code.

Elm 0 votes

Elm is a type-safe functional language that compiles to HTML, CSS, and JavaScript.

Elm's major distinguishing features are support for reactive programming and its focus on visual presentation. Elm is also call-by-value and strongly / statically typed with type inference, so those of you already familiar with Haskell or ML should be quite comfortable.
Elm is very much a work in progress, so think of this as a preview. The language and compiler are both very early prototypes, and both will improve as my thesis work progresses.
Interactive Editor
Elm's interactive editor lets you start writing in Elm without any install or setup, so check out the examples to see Elm in action!