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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.

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

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.

This gem will help you to handle has_many :through associations when you need to add/remove these ones with checkboxes.