Web Developer Tools

General debugging tools:
Firebug - Popular Firefox extension for web developers.
Web Developer - Another Firefox extension containing good set of tools.
JS Deminifier - Good for expending minified JS.
Firecookie - Cookie manager for Firebug.
JS beautifier - Reformats JavaScript source code to make it more readable.
JS beautifier2 - Reformats JavaScript source code.

Web Application Testing Frameworks:
Watir - Ruby based framework for browser automation. examples
Webdriver - Browser automation framework.

Create Rails project with any version

gem list
rails (3.0.5,2.3.11)

rails -v
Rails 3.0.5

#Create a rails project with version 2.3.11
rails _2.3.11_ MyProject