Discourse is the 100% open source, next-generation discussion platform. Discourse is a from-scratch reboot, an attempt to reimagine what a modern, sustainable, fully open-source Internet discussion platform should be today – both from a technology standpoint and a sociology standpoint.

Discourse is a JavaScript application that runs in your web browser, using the Ember.js JavaScript framework.

The server side of Discourse is written in Ruby on Rails with a Postgres database.

Kandan has really cool features and beautiful interface. It enables to manage multiple chat rooms simultaneously, easily share images, youtube links, etc.

• Searchable Message History
• File Uploads
• Multiple Chat Room Management
• Shared Room Audio
• Easy deploy to with CloudFoundry, Heroku, dotCloud, etc.
• Collaborative Team Chat
• Unlimited Channels

It includes extensive capabilities to build Ruby and Rails applications in addition to support for HTML, CSS and JavaScript editing.

It comes with many features including support for project navigation, smart code assistance, visual debugging and structure outlining.

It comes as Standalone and Eclipse Plug-in Versions.

Take advantage of advanced features like recurring invoices and quotes, upload your company logo, manage your customers from a centralized list and feel free to invite your accountant/bookkeeper to access your Billing Boss transactions anytime.

The data is encrypted and stored in a state of the art facility with regular backup. It uses 256-bit AES encryption to transmit your data. A mobile version is available and can be accessed on your iPhone, Blackberry or Android.

With Fedena, you can manage student databases & it helps to deal with all school management related issues.

Few features of this open source school erp are:

• Friendly user interface
• Manage student admissions & academic year
• Examination management
• Timetable & Attendance management

Website: http://projectfedena.org/

Demo: http://demo.projectfedena.org (user: admin / pass: admin123)

Spree capitalizes on the dynamic nature of the Ruby programming language to provide the most flexible ecommerce platform available.

In addition to a powerful extension system, Spree provides several explicit extension points for providing custom logic for checkout, shipping, taxation, etc.

Features

• Extensible Design
• Unobtrusive Javascript
• Over 50 Payment Gateways Supported
• Custom Tax Logic
• Google Analytics

This open source shopping cart software has been designed with Search Engine Optimization (SEO) as a primary focus. Features such as human readable permalinks and unobtrusive javascript are built right into Spree.

Spree is distributed as a Ruby gem, available on Gem Cutter. You can download the complete source code associated with a release from GitHub.

Website: http://www.spreecommerce.com/

Radiant features an elegant administrative interface that centers around three key components: pages, snippets, and layouts.

Content that is used in multiple places can be stored in a snippet. Snippets are very similar to PHP includes or Rails partials.

It’s easy for developers to extend Radiant as it is built on a widely accepted Web application development platform.

Website: http://radiantcms.org/

Demo: http://radiantcms.org/demo/

Mongrel was originally written by Zed A. Shaw. It is licensed under the Ruby License. Mongrel and related files can be downloaded manually from RubyForge.

Website: http://mongrel.rubyforge.org

Railfrog makes it easy for developers, designers, webmasters, or just about anyone else to deploy and manage a website.

Website: http://www.railfrog.com