A good user interface means more conversions and more sales, visitors, money.

If you want to learn how to build one, GoodUI is a good place to start.

GoodUI lists user interface tips that can help boosting your conversions. You can subscribe to receive updates twice a month, not too painstaking for a professional designer.

P.S. ‘Never take advice from someone who needs it’, says the proverb. The UI of the website is fabulous, so you needn’t afraid of bad advice here!

Windows is a plugin for creating full-screen scrolling windows.

Basically, the plugin creates as many scrolling windows as you like, allowing to place arrays of content into scrollable goodness.

Windows automatically centers the ‘window’ that takes the most part of the screen, so it’s easy for users to enjoy the full-screen experience this plugin strives to provide.

As a side note, the name of this plugin illustrates that websites like ours here are much in need. Imagine how hard it’d be to find a plugin like this if you hadn’t seen it here – not to mention the problem of actually finding this plugin on Google.

simplePagination.js is a Bootstrap-compatible pagination plugin.

simplePagination.js ships together with three beautiful themes. It can be heavily customized and has a number of methods for thoroughly manipulating the plugin.

Overall this is a very simple plugin, but it’s also very light and does what it says on the box.

CSS Modal is a library for building CSS-powered modal dialogues.

CSS Modal uses bits of JavaScript for making the modal dialogues more accessible. CSS Modal is optimized for mobile phones and can be used as a SASS plugin as well.

It’s small and fast and makes for a welcome addition to a light and minimalist design.

Codrops have published a great tutorial that shows how to create a responsive, retina-ready menu.

The tutorial goes into detail on creating a responsive design with three separate designs for desktops, tablets and mobiles.

You can download it for free and customize it ad infinitum.

MixItUp is a CSS3/jQuery-powered filter & sort plugin.

MixItUp orders filtered and sorted plugins with animated motions. It’s great for fluid and responsive layouts, such as those for blogs, portfolios, galleries and more — the developers have even created a playing card demo.

It’s well documented and the website of the plugin does well to showcase the different things you can do with this plugin.

The sole drawback is — you guessed it — browser support: only modern browsers and IE10 are supported at the moment.