Highlight the points of interest of your products

Link here.

Nice ways to curve your text

Link here.

A nice and minimalistic progress bar

Link here.

Preload assets(eg. images) on your page

Link here.

Know which css is going unused

Link here.

Tired of figuring out how to vertically(or horizontally) center your elements? Here's a javascript plugin!

Link here.

Easy library to make charts and graphs

Link here.

Count character, words and paragraphs entered by a user live

A very small plugin that has no dependencies.
Link here.

A plugin if you want to use excel/spreadsheet formulas.

Link here.

Ready css3 animations

Link here.

Write better html using HTML inspector plugin

Link here.

Beautiful analysis and visualization tool

Link here.

A javascript library, Cytoscape.js for analysis and visualization

Link here.

Need more visible area when you type in a textbox?

Link here.

Simple nice plugin to show tips on hovering on elements the way you want to.

Link here.

A javascript library to enable gamepads and joysticks in the browser.

Link here.

Responsive datepicker

Link here.

Load high resolution image for retina display screens

Link here.

Looking to make a jquery plugin?

Lots of jquery plugin patterns to start off here.

Readymade plugin for Paypal 'Buy now!'

Link here.