RubyMine (Idea) Aptana 3 (Aptana)

RubyMine costs money. The reason my team uses it is for the refactoring tools and autocompletion capabilities. Though they do fight with it more often than not. According to them the refactoring tools makes it worth it.

I like Aptana 3. The problem is that the current version is not that incredible (a few quite annoying bugs), however I am waiting for good refactoring support.