html prototyping


Mixture

Hammer for Mac

Text Snippets

jKit: jQuery based UI Toolkit

One div: Pure CSS icons

Ai to Canvas Plug-In

Wirefy: Responsive Wireframe Library
Responsive Design Bookmarklet

Bootstrap, from Twitter
InstaCSS: CSS Documentation Search

Animate.css: Plug-and-play CSS animation styleshee ...

{placekitten}

Placehold.it: Simple image placeholders

lorempixum: Placeholder images for every case
Wirify: Create wireframes from web pages