Which IDE should I use with Ruby on Rails?

The answer depends on what sort of programming environment that you are used to using. If you are just learning a Rails then it's best that you don't burden yourself with learning a new IDE too. If you've already been using an IDE for another programming language, then I suggest sticking with the Rails equivalent, at least until you're familiar with Rails and its rake commands.

Some popular IDEs that have Rails support are:

• Eclipse (via RadRails) - This is the most popular free IDE
• JetBrains (via RubyMine) - This is the most popular paid IDE
• Netbeans - Netbeans discontinued official support as of version 7.0, but there is a community supported plugin
• Visual Studio (via Ruby in Steel) - Is somewhat expensive but will please Visual Studio fans. Has a free 60-day trial
• Komodo IDE - Has auto-complete and debugging features for Ruby on Rails

Many developers who use Ruby on Rails prefer to develop using a text editor rather than an IDE. See: Which text editor should I use with Ruby on Rails?