Some nice jquery plugins

1. jquery count down timer :
“A jQuery plugin that sets a division or span to show a countdown to a given time”

2.jquery tooltips :
    “A jQuery plugin to add balloon tips to elements User-friendly, fine-tunable and without css and images. Simple Tooltips

3. on demand loading contents : 
     “jQuery ScrollPagination plugin has been for loading the contents on demand based on your scrolling ” 

4. masonary :
      “Masonry is a dynamic grid layout plugin for jQuery. Think of it as the flip-side of CSS floats. Whereas floating arranges elements horizontally then vertically, Masonry arranges elements vertically, positioning each element in the next open spot in the grid. The result minimizes vertical gaps between elements of varying height, just like a mason fitting stones in a wall.