HTML5 Up! is a set of HTML5 & CSS3 templates for responsive websites.

At the moment the website consists of 12 templates that are all fully responsive and look very well.

The templates are customizable and are released under the CC licence.

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.

WireKit is a set of scalable PhotoShop shape layers for wireframing iPhone apps.

WireKit comes in two separate styles with 60+ of the most common UI elements; this makes wireframing super fast and easy, allowing you to focus on the what not how.

The shapes are retina-ready and are available in distinct black & white themes.

Responsable is a full-blown responsive framework for HTML, CSS, LESS and SCSS.

The framework has a clean markup and has its code normalized for consistency across browsers.

Besides that, it has the following features:

• Nested columns;
• Baseline grid for improved typography;
• Responsive images;
• Base styles;
• etc.

All in all, Responsable looks like a good enough responsive design framework — I wouldn’t know, however, which one to pick from the plethora out there.

Sassaparilla is a “set of default rules and style” that starts a website in a consistent manner.

Sassaparilla is very useful for devs as it provides consistent vertical rhythm, and also allows working in pixels consistently.

This template, if one can call Sassaparilla a template, follows a minimalist design; it works with SASS and thus features variables as well.

Iconbeast is a set of 300 free iOS tab bar icons.

Iconbeast icons are developed for iOS app development. The free version of these icons comes in 30px alpha-transparent PNG.

While the icon set is free it requires attribution. It does, however, have a number of very useful icons for any mobile/tablet application.