Here is few scripts to work with pdf files.
They communicate with rails application via active messaging.
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rip_server(RS) - to parse pdf to images and pdfs
pdf_create(PC) - to create pdf from fo(xml) file

RS uses:
  [*] RMagick - https://github.com/rmagick/rmagick
  [*] builder - https://github.com/jimweirich/builder
  [*] AMQP    - https://github.com/tmm1/amqp
  [*] json    - https://github.com/flori/json

PC uses:
  [*] AMQP    - https://github.com/tmm1/amqp
  [*] json    - https://github.com/flori/json
  [*] FOP     - http://xmlgraphics.apache.org/fop/index.html
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by Sfate, 2011