Changeful is a gem that converts your static content in your views to be stored into database. Thereafter, administrator can use RailsAdmin or Active Admin to edit the static content.

A simple, yet flexible solution to tracking changes made to objects in your database.

ChangeManager uses Resque and resque-scheduler to detect changes in ActiveRecord objects, then applies logic to them.

Gem for using Chaplin.js with Rails asset pipeline, based on chaplin-rails boilerplate project.

Admin framework for rails + mongoid web applications.

Simple overlay instructions for your apps.

Extend your Rails forms with character countdown fields easy with just setting validations to your models.

A Rails Engine that handles Chargify Webhooks requests and validates and forwards them off to registered loops.

ChartJs with ruby.

Will draw chart

gem chartist_js for include chartist-js lib to RoR project

This Gem is based on this github project https://github.com/nnnick/Chart.js/tree/master

chartjs-zoomable lets you use Chartjs graphs using helper methods in your views with zoom and pan functionality

send newsletter with chaski

Chaskiq.

Adds a chat functionality to any Rails 3 application. Send chat messages to online users within your application like any gmail/facebook chat. It assumes that you are using devise gem and user model as devise model for login.

Making it easy to set it up a live chat on your website.

A rails plugin for the chawk storage engine for time-series data.

HTTPS login from a separate domain

Add just a couple of lines to your app, and have it receive exceptions from your other apps via the hoptoad_notifier.