Skel JS is a sophisticated 12 column CSS grid system with tons of cool features and a concise, uncluttered syntax for building responsive sites and apps.

It offers a streamlined replacement for CSS media queries that’s intelligent and extremely easy to work with. It comes with handy shortcuts to deal with common CSS tasks, like browser resets and global box model changes.

Skel JS also has no dependencies and will play nice with (most) other libraries and frameworks.

User experience (UX) is how a user feels when interacting with a system. The system could be a website, a web application or desktop software and, in modern contexts, is generally denoted by some form of human-computer interaction (HCI).

Rapid Prototyping Tool: Axure

Creates Responsive Interactive Wireframes And Prototypes: UxPin

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The Markup Framework is a collection of layouts, widgets, typographic styles and other UI components to use as a starting point for your own Web designs.

WireKit is a set of free Photoshop shape layers to make wireframing your next iPhone app a little easier.

It contains 840 x 8600 pixels of retina-friendly-made-to-measure-scalable goodness presented in two unique styles, each with over 60 of the most common UI elements.

LayoutIt! is a handy online tool to create your frontend code quickly with Bootstrap using an easy to use drag & drop interface builder.

LayoutIt! takes every element and component of Bootstrap to make your frontend coding easier without needing to be an expert in JavaScript, HTML5 or CSS3.

You just build what you need to start, and then code it however you most like!

Flat UI Free – PSD & HTML User Interface Kit

Flat Dashboard – Free UI kit PSD

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FPSMeter is a simple JavaScript library for sexy, fast, and themable FPS meter. It can measure:

• Frames per second
• Number of milliseconds between frames
• Number of milliseconds it takes to render one frame

FPSMeter supports multiple instances on one page, has show/hide methods that also pause the meter rendering, and color heatmaps that make themes even more pretty!

csscss is a CSS redundancy analyzer, it will parse any CSS files you give it and let you know which rule sets have duplicated declarations.

One of the best strategies to maintain CSS is to reduce duplication as much as possible. To do that, you need to have all the rule sets in your head at all times. That’s hard, csscss is easy.

Polycode is a free, open source framework for building cross platform games and interactive applications.

You can use Polycode as a C++ library or write everything in Lua using the Polycode IDE. Polycode’s API is designed around the “do more with less code” philosophy. It uses a managed scenegraph system that takes care of rendering and updates, but provides the ability to do custom rendering and updates if you so wish.

bluePen is an online visual CSS editor for your websites. bluePen can be easily installed even on a dynamic website. Once you have installed it, you can make your style sheet modifications anytime, anywhere.

Everything you modify will be updated real-time in your browser (but not on the live website yet). The modifications will be published right after you’ve pressed the ‘Save’ button.