Chained is simple jQuery plugin for chained selects. There are two different versions.
This plugin has a very nice visual editor for customizing the JSON data and a visualizer that provides a different view for it.
jqTree is a jQuery tree plugin with many options and functions. Also it has drag & drop support for tree nodes.
serializeObject is a variant of existing
$.serialize method which, instead of encoding form elements to string, converts form elements to a valid JSON object.
SlickQuiz is a jQuery plugin for creating pretty, dynamic quizzes.
Agile Carousel is a jQuery plugin that allows us to create flexible (both in function and design) slideshows and carousel.
The plugin uses JSON for the data format of the slides. You can select between "fade" or "slide" as the transition effect, duration of the transitions and intervals between each slide can all be defined.
Mosaiqy is a jQuery plugin for viewing and zooming photo working on Opera 9+, Firefox 3.6+, Safari 3.2+, Chrome and IE7+. Photos are retrieved from a JSON/JSONP data structure and randomly moved inside the grid. All expensive animations are taken over by your GPU on recent browsers using CSS3 transitions, minimizing the CPU overhead.
jCookies, a jQuery plugin, makes getting and settings HTTP Cookies a breeze. jCookies allows the storage of any type of data: strings, arrays, objects, etc. Data is stored in the cookie as JSON data. Also you can retrieve data using server side code such as C# and PHP.
The jQuery Form Plugin allows you to easily and unobtrusively upgrade HTML forms to use AJAX. The main methods, ajaxForm and ajaxSubmit, gather information from the form element to determine how to manage the submit process. Both of these methods support numerous options which allows you to have full control over how the data is submitted.
This is a jQuery plugin for converting data from XML to JSON format. However its real power lies in its ability to also remap data to a different structure. This can be useful when you have a plugin or application that requires JSON data, but the data is coming from an XML feed that you don't have structural control over. Data is remapped to the structure you need.
jQuery Gantt Chart is a simple chart that implements gantt functionality as a jQuery plugin. Plugin uses AJAX to retrive JSON data and render them as Gantt chart with many features such as zooming or paging.
XML to JSON Plugin (jQuery.xml2json) is a script you can use to convert simple XML into a JSON object.