Which are the precious Rails RubyGems that Railers can't live without? [closed]

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There are a lot of interesting gems beyond the classic Rails gem pack: cucumber, formtastic, rspec, shoulda, coulda, webrat, selenium, will_paginate, authlogic, searchlogic, inherited resources ...

Let's make some effort to catalog the best Rails gems on SO.

I'm new to the Rails community and a little bit lost with so many options for resolving the issues.

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Passenger!!

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• NewRelic RPM
• Hoptoad
• Authlogic
• Haml

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Who could live without RedCloth and hpricot?

Also worth mentioning are two fine irb enhancers: hirb and wirble

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Clearance - http://github.com/thoughtbot/clearance

Paperclip - http://github.com/thoughtbot/paperclip

FactoryGirl - http://github.com/thoughtbot/factory_girl

Sprockets - http://www.getsprockets.com/

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• RSpec - http://rspec.info/rails/
• Viget Deployment - http://github.com/vigetlabs/viget_deployment

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jRails of course.

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will_paginate,attachment_fu,rspec these are coool

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Devise for user authentication: https://github.com/plataformatec/devise

Prawn for PDF generation: https://github.com/prawnpdf/prawn

ActiveScaffold for CRUD: https://github.com/activescaffold/active_scaffold