+1 for NetBeans.
Or if you want to try something else, also look using the Aptana Studio
or the related plugins for Eclipse. That includes all of the
functionality formerly captured by “Rad Rails”
Andrew P. Tasi
Is there a good IDE for Ruby?
At the moment am using “vi”, plan to migrate to TextEditor under GNOME
I tried downloading ruby-ide from http://www.ruby-ide.com/
But it kept making me go round and round to get a trial version.