Markin_messenger is a project mainly written in Ruby, it's free.
A Rails plugin to handle upload of zipped image files with some basic uncompressing and paperclip support.
=MarkinMessenger
MarkinMessenger is an extension for Papcerlip attached models. It provides an uncompressing function for zipfiles and a watermarking the zip images.
==Example
In your model:
class Asset < ActiveRecord::Base
print_with_watermark {:zip => {:compress => :false}, :style => {:size => "200x200"}, :watermark => {:text => "Lorem ipsum"},:storage =>{:folder => "public/foobar"}
:thumb => {:printover => "vorschau"}}
endCopyright (c) 2009 [Daniel Schmidt], released under the MIT license