jquerysvg is a jQuery plugin that lets you interact with an SVG canvas, which can handle any kind of content for the Rails 3.1+ asset pipeline. It supports all new and old major and not so major browsers. It's distributed under the MIT License.

JqueryTextcomplete is a Ruby on Rails gem enabling text autocomplete in search fields, textareas, and other textfield inputs! Can be used in conjunction with searchkick gem for suggesting autocomplete results and with acts-as-taggable-on gem for autocomplete tagging. Requires Jquery.

A gem to integrate the timeago.js

This gem provides the JQuery Timeago plugin for your Rails application.

This gem adds jquery-titlealert to your rails app

jQuery Toastmessage Plugin's JavaScript, Stylesheet and images packaged for Rails asset pipeline

jQuery Truncate plugin

jQuery-UI-formbuilder is a Ruby on Rails FormBuilder DSL powered by jQuery-UI

jQuery UI Rails Helpers

Plays nicely with requirejs-rails gem

Bunch of jquery event handlers for dealing with standard Rails json responses.

This is just an underscore add-on of André's jquery-rails which provides a Rails generator to install jQuery and the jQuery-ujs driver into your Rails 3 application, and then have them included automatically instead of Prototype.

Package jQuery Uploadify plugin's javascript, stylesheet and images for Rails asset pipeline

This gem just adds jquery-waypoints to your ASSets

Wrapper for https://github.com/themouette/jquery-week-calendar

Simple

Adds autocomplete support to rails inputs, using jQuery-UI; it works similarly to the original rails autocomplete plugin, but generating unobtrusive javascript.

JRB is a trivial templating engine that allows you to use plain Ruby files as templates.

Rails plugin that provides an allow/deny DSL for controlling access

Access paths to compiled assets from in javascript.