session :off, :only => :foo, :if => Proc.new { |req| req.params[:bar] }

SexItUp allows for the easy drop-in of public domain images for site mockups and user avatars.

The shoelace-rails gem adds useful view helper methods for using Shoalace Web Components.

A lightweight library for encoding/decoding Rails request parameters.

Initialises Simple Form to automatically produce Bootstrap 3-friendly markup

This gem adds Bootstrap2 and Bootstrap3 renderers for SimpleNavigation

Really convenient way to set up page titles in a Rails application.

Because every time I create a new webapp, I think about how I should process user-generated content. Should convert urls to links and images? Should I allow certain tags? Should I convert all new lines to *br* tags? Well, now all that is as simple as calling a single method.

Sweetify allows you to easily use SweetAlert within your controllers

simple, flexible and fast html table generator

Removes the tedium of form filling with SitePrism by allowing you to specify a set of fields, actions and submissions rather than procedurally calling Capybara’s DSL methods.

Gem for parsing bbcode-formatted strings to HTML or any other formatting you like (or don't like).

Thebes is a thin binding layer for Rails and Sphinx via Riddle and Mysql2. Thebes expects you to write Sphinx configuration files by hand and have a rich understanding of Sphinx, but provides configuration files and templates to ease the process.

Simple view helpers for your layouts

TorqueBox Web Gem

TurboStreamer is a JBuilder-like DSL for building JSON that streams directly to a string or IO

twitter-bootstrap-rails project integrates Bootstrap CSS toolkit for Rails 3.1 Asset Pipeline and turbolinks

UglifierWithSourceMaps overrides parts of sprockets to create sourcemaps using uglifier for your javascript assets. It is meant to be used in production.

This adds Uservoice support to your Rails application including single sign-on.

A captcha verification approach for Rails apps, directly integrated into ActiveRecord’s validation mechanism and providing helpers for ActionController and ActionView.