hughlight

jquery-pjax

pushState + ajax = pjax

jQuery-File-Upload

File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.

backbone

Give your JS App some Backbone with Models, Views, Collections, and Events

jquery-accordion

This is a customisable accordion widget for jQuery.

rails_admin

RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data

handlebars.js

Minimal templating on steroids.

ICanHaz.js

A clean solution for templating with Mustache.js and jQuery or Zepto

backup2s3

A rails plugin to backup application files and a mysql database to Amazon S3

Aristo-jQuery-UI-Theme

The "Aristo" theme for Cappuccino ported to a jQuery UI Theme

mustache.php

A Mustache implementation in PHP.

Senbei

An iPhone client for Fat Free CRM

simple_form

Forms made easy for Rails! It's tied to a simple DSL, with no opinion on markup.

SlickGrid

A lightning fast JavaScript grid/spreadsheet

ancestry

Organise ActiveRecord model into a tree structure

jquery-autosave

codeigniter-restserver

A fully RESTful server implementation for CodeIgniter using one library, one config file and one controller.

redbean

ORM layer that creates models, config and database on the fly

jquery_jeditable

jQuery edit in place plugin. Extendable via plugin architecture. Plugins for plugin. Really.

jquery-treetable

jQuery plugin to show a tree structure in a table

carrierwave

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

quicksearch

A jQuery plugin for searching through tables, lists, etc quickly

awesome_nested_set

An awesome replacement for acts_as_nested_set and better_nested_set.