Ruby On Rails

Wikipedia describes Ruby on Rails:

Ruby on Rails is a free web application framework. It aims to increase the speed and ease with which database-driven web sites can be created, and offers skeleton code frameworks (scaffolding) from the outset. Often shortened to Rails, or RoR, Ruby on Rails is an open source project written in the Ruby programming language, and applications using the Rails framework are developed using the Model-View-Controller design paradigm.

Ruby on Rails led the charge among next-generation web application frameworks, popularizing features that are now considered standard, such as scaffolding, object-relational mapping and simple installation. Other projects such as Catalyst, Django and TurboGears followed suit.

Ruby on Rails divides itself into various packages, namely Active Record, Active Resource, Action Pack, Active Support, Action Mailer and Action Web Service. Apart from standard packages, developers can make plugins to extend existing packages.