Rewriting existing applications from scratch in a Big Bang-style is rarely a good idea and often ends in failure. Chad Fowler wrote a good post summarizing some of the reasons why a year ago: The Big Rewrite.
Ruby on Rails
The open-source framework that I created in 2004. Ruby on Rails is an open-source web framework that's optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration.Learn more about Ruby on Rails