Photo galleriesJavaScript libraries
Open source JavaScript image gallery and lightbox

JavaScript libraries
Touch enabled jQuery plugin that lets you create beautiful responsive carousel slider

JavaScript libraries
jQuery The Write Less Do More JavaScript Library

JavaScript libraries
Ajax Autocomplete for jQuery allows you to easily create autocomplete autosuggest boxes for text input fields devbridge jQuery Autocomplete

Widgets
AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget

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