QueryBuilder can be used on advanced search engine pages, administration backends, etc. to build complex queries or filters. It is highly customisable and can be used with many jQuery widgets like autocompleters and sliders.
It outputs a structured JSON of rules which can be easily parsed to create SQL/NoSQL/whatever queries.
I've recently started putting together a Tk-over-jQuery routine I'm calling web Tk (wtk). The idea is having full Tcl running on a server, with a Tk-like layer that sends commands to code running in a browser.
The LobsterPot HTML5 PivotViewer is a cross browser, cross platform version of the Silverlight PivotViewer control produced by Microsoft. Created by LobsterPot Solutions the control has been written as jQuery plug-in and utilises features available in HTML5.
One of the most appealing features of the HTML5 File API is that you can pass the file data to the XmlHttpRequest object for uploading to a server, but large files are still a problem. This article explains how to use the Blueimp jQuery-File-Upload Plugin in your web pages so large files can be easily uploaded.