Fluid (responsive, adaptive) layout is today a default requirement when developing a website and, whether we want it or not, we somehow re-orient our thinking towards a tablet-like approach in working with website layouts.
GridSystem is a plugin to help you calculate and deal with columns and responsive layout.
Slideme is a responsive, css3, compatible (works fine even with IE7), customizable, easy to install (and use), multi-instance, fullscreen, cool, powerful slideshow plugin for jQuery.
FerroMenu is a free jQuery plugin that allows you to create animatable, responsive, user and mobile friendly bubble menus in a cool way and drag them through the screen.
With sevaral options you can customize the behaviuor of FerroMenu. It can be dragged around the screen, or you can set the transition time, delay and easing.
Mobify.js is an open source library for improving responsive sites by providing responsive images, JS/CSS optimization, Adaptive Templating and more.
Mobify.js also provides a “Capturing” API for manipulating the DOM before any resources have loaded, giving developers the ability to enable the listed features above without changing any backend markup.
Balanced Gallery is a jQuery plugin that evenly distributes photos across rows or columns, making the most of the space provided. Photos are scaled based on the size of the 'container' element by default, making Balanced Gallery a good choice for responsive websites.
Intention.js offers a light-weight and clear way to dynamically restructure HTML in a responsive manner.
Easily increase layout options and flexibility, reduce development time and lessen dependence on media-query-driven stylesheet overrides.
Wallpaper is a jQuery plugin for smooth-scaling, element-filling backgrounds. A really simple way to add element-filling background images.
jQuery Fluid Content Scroller plugin makes navigation through long item lists like news, events, blog posts, etc. smooth and easy. Plugin is represented with the tabbed navigation panel at the top and at the bottom of the page / list container allowing to instantly scroll up and down to a particular post on the list.
A flat and responsive calendar made with jQuery. Initiated with a jQuery function or with HTML code.
A tutorial about Creating Responsive Share Buttons by using jQuery and CSS.
Advantage of creating own set of share buttons is that, it goes well with your layout, and you don't have to rely on bulky files that are loaded from anonymous servers, which could also slow down the page loading time significantly.
SlickNav is a responsive mobile menu plugin for jQuery.
Freewall is a responsive and cross-browser jQuery plugin for creating dynamic grid layouts for desktop, mobile and tablet.
Freewall allows you to create many types of grid layout (flexible layout, images layout, pinterest-like layout, etc) with nice CSS3 animation effects and call back events.
Glide is responsive and touch-friendly jQuery slider. Based on CSS3 transitions with fallback to older broswers. It's simple, lightweight and fast.
Also it has features such as; Swipe event, Arrows and bullets navigation, Keyboard navigation, Autoplay, Pause on hover etc...