Frontify lets yous create your complete and beautiful style guide in less than 5 minutes! It’s simple, fast and fun. Document and maintain your brand or design guidelines with an online tool. Forget about the time consuming manual creation of PDF style guides. Frontify Style Guide makes professional style guide creation a fast and fun experience.
Frontify Style Guide is build to be usable without learning, so that you can get started instantly. Our educational material, tutorials and documentations are meant to provide best practices, deeper insights and help inspire our users. Start instantly from scratch, choose between own or various predefined style guide templates. Templates do not only contain editable structure, but also helpful content suggestions and style guide best practices.

Requirements: –
Demo: https://frontify.com/styleguide
License: Free Plans Available
One of the most challenging things as a Web Developer or Web Designer, may be to come up with new ideas on how to get things done quickly, efficiently, and at a good price. There is a website set up which will help you in your job or hobby as a developer/designer, and allow you to find the best deals out there for each aspect of the job; DealsKiller.com.

One of the features offered on this website is the ability to find time restrained deals. Each web design deals offered has a time limit, and you can search for the deals you need which may expire quickly. You may also find new deals throughout any given day, which will offer you the opportunity to jump right on them.
Web Developing and Design has never been easier than it can be when you use the best deals. DealsKiller offer ease of use, good deals, new deals daily, and time saving techniques, for all your web development needs. Do a search to see what you can find to help your website along.
People at Big Bite found it really annoying to have to calculate grid widths — especially within nested spaces — within his designs without ending up with crazy numbers of vertical guides or guide shapes. After not finding a tool that worked exactly how he wanted it too, they at Big Bite created Grid.Guide. Guide to solve the problem. It uses a max width and column count to calculate possible whole pixel column and gutter width combinations. It generates PNGs so you can drag or copy them straight into your designs. It’s free to use!

Requirements: –
Demo: http://grid.guide/
License: License Free
So I guess you already know the base id, class and descendant selectors. And this is quite enough for you to get the job done. If so, you’re missing out on a lot of stuff and most likely your code is pretty messy. I know that sometimes it’s hard to remember all of them so lets go through the ones that are quite interesting, rare and most importantly really useful. Technically, CSS doesn’t have the ability to count an element’s siblings.
However, Heydon recently showed us what he calls Quantity Queries: a clever combination of :nth-last-child(), :first-child, and ~ to style elements based on how many elements are in a single parent. Quantity Queries is a tool designed to help build and understand Quantity Queries.

Requirements: –
Demo: http://quantityqueries.com/
License: License Free
Styleguide is a tool to make creating and maintaining styleguides easy. All you need to do is to add the Styleguide to a separate folder in your project. Use it as your CSS. You just need to import the generated file inside your HTML and you are all set! This way the Styleguide will be synced with your project. Isn’t that awesome!?
Just copy your project’s CSS and paste it in the Styleguide CSS file. Now you only need to customize the modules to use the proper classes. You can always create/edit any module when you need. The Styleguide is also a independent project. You can download it and use it in your browser. Then all you need to do is edit it’s CSS and set/customize the modules. When you are finished you can send the files to a server or use the HTML version.

Requirements: –
Demo: http://hugeinc.github.io/styleguide/
License: License Free
Image Blur Plugin is an Ultra small plugin (4kb minified, 1.5kb gzipped) for Blurring images. This plugin utilizes SVG filter to blur the image if SVG is supported by the browser (all except IE), otherwise the plugin creates an IMG tag and applies a special IE-only filter in CSS. If you are using Velocity.js animation library, the plugin will automatically detect its presence and make fade in/fade out animations more performant, especially on mobile. If Velocity is not present on the page, jQuery’s “animate” is used.

Requirements: JavaScript Framework
Demo: http://msurguy.github.io/background-blur/
License: MIT License
Huginn is a system for building agents that perform automated tasks for you online. They can read the web, watch for events, and take actions on your behalf. Huginn’s Agents create and consume events, propagating them along a directed graph. Think of it as a hackable Yahoo! Pipes plus IFTTT on your own server. You always know who has your data. You do.

Requirements: –
Demo: https://github.com/cantino/huginn
License: MIT License
LaunchKit’s App Website tool creates and hosts a mobile-ready, smart solution for anyone who needs to quickly launch a website for their app. LaunchKit provides 9 simple and attractive designs for your website. Just enter your app’s name and watch your landing page appear.
If someone visits your page on an iPhone, they don’t need to see an Android download badge. We only show them download triggers for the platform they’re on. Turn website visitors into app users. Create your website in minutes. It’s free.

Demo: https://launchkit.io/websites/
JavaScript.com is a resource built by the Code School team for the JavaScript community. It is now and will always be free. Because JavaScript is a great language for coding beginners, They have gathered some of the best free learning resources around and built a JavaScript course to help new developers get up and running.
With the help of community members contributing content to the site, JavaScript.com aims to also keep more advanced developers up to date on news, frameworks, and libraries.

Requirements: –
Demo: https://www.javascript.com/
License: License Free
Codyhouse has put together a set of Page Scroll Effects, they are some fancy effects that take place while the user is surfing through the sections of a web page. Some of the effects are quite extreme, but they can prove very useful if your goal is to create an immersive user experience. All animations have been created using Velocity.js.
Please note that these effects are not visible on small devices, where the user can simply scroll through the list of sections. They have tested the effects on mobile and performance was poor, therefore they decided to limit them to bigger and more powerful devices.

Requirements: JavaScript Framework
Demo: http://codyhouse.co/demo/page-scroll-effects/scaledown.html
License: License Free