This is a brief introduction into the world of web development and Ruby. To view all the different gems listed by popularity check out the Ruby Toolbox.
- Rails - the most popular, although recently has been criticised for being a bit bloated - giving you more than you often need to build a simple web site
- Sinatra - takes the opposite principal, more of a "micro framework" that starts with just enough to get you going, and you can then add Gems for more advanced stuff as and when you need it