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Re:Oracle discontinues Ruby/Rails support for NetBeans by luigi on Thursday January 27, 2011 @10:55AM (#2148253)
RubyMine seems to be the most popular these days:

http://www.jetbrains.com/ruby/

Re:Oracle discontinues Ruby/Rails support for NetBeans by sigzero on Thursday January 27, 2011 @01:18PM (#2148844)
If I was doing any kind of Ruby work I would go with that. I am using PyCharm from Jetbrains for Python work and really like it.