Ruby on Rails is an open-source full-stack web application framework developed by David Heinemeier Hansson, initially for the Basecamp application. It emphasizes principles like DRY (Don't Repeat Yourself) and convention over configuration, facilitating rapid application development with extensive support for testing, code generation, and various database systems. Supported by companies such as Google and IBM, Ruby on Rails runs on multiple platforms including Linux, Windows, and macOS.

1. Ruby on Rails Open source web application Framework

2. What’s Ruby on Rails? A Full stack web development framework (but not only for web) Using the mighty Ruby Language.

3. History Rails was developed by David Heinemeier Hansson of 37 Signals Built for BaseCamp Application Later ‘Open Sourced’ Acceptance within a year.

4. RoR Philosophies DRY (Don’t Repeat Yourself) Convention over Configuration Simplicity – (Easy design patterns) Effective MVC Agile Methodologies Open source

5. Advantages Philosophies == Advantages

6. Advantages Even then,

7. Advantages Super Rapid Application development Full-Stack Lightweight Extensive testing framework Design patterns support Code Generation Powerful HTTP mapping Built-in AJAX support Object-Relational Mapping Helpers Migrations Lots of plugins Source Control Integration Inflections

8. Whats more? Rake ActionPack ActiveRecord ActionMailer ActionWebservice Capistrano Prototype RJS Needle

9. Platforms supported Linux Most of the Unix flavors Windows Mac OS X Apache Lighttpd IIS Oracle MySQL Postgres MS SQL Server DB2 SQLite

10. Who is supporting it? Google IBM Revver Apple odeo Epson Basecamp Apple HCL Eines.de 43things Blinksale Kiko Slideshare.net

12. References Rubyonrails.com developer.apple.com/tools/rubyonrails.html Ruby-lang.org