Utilities
Paperclip by Jon Yurek
Paperclip is intended as an easy file attachment library for ActiveRecord. The intent behind it was to keep setup as easy as possible and to treat files as much like other attributes as possible. This means they aren’t saved to their final locations on disk, nor are they deleted if set to nil, until ActiveRecord::Base#save is called. It manages validations based on size and presence, if required. It can transform its assigned image into thumbnails if needed, and the prerequisites are as simple as installing ImageMagick (which, for most modern Unix-based systems, is as easy as installing the right packages). Attached files are saved to the filesystem and referenced in the browser by an easily understandable specification, which has sensible and useful defaults.
ActionMessager by James Golick
ActionMessager is a simple framework for creating IM-based notifiers. It is structured like ActionMailer, so it's got virtually zero learning curve for most rails developers. What's more, because the syntax is the same, it's pretty easy to create a delegate class that acts like your mailer, but sends IMs as well. That means drop-in replacement!
file_column by Anonymous
Easy file attachment plugin
attachment_fu by Rick Olson
attachment_fu is a plugin by Rick Olson (aka technoweenie
Active_merchant by Anonymous
Ruby library for dealing with credit cards and payment processors and shipping.
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