Forms for Nguyên is Ruby library that could merge PDF fields by XFDF/FDF via pdftk.

Uses wkhtmltopdf to create PDFs using HTML, add :exe option

Stitching and unstitching for PDFs. A java library delivered via ruby out of convenience.

A framework for creating e-books from Markdown/Textile text markup using Ruby. Using the Prince PDF generator, you'll be able to get high quality PDFs. Mac users that have Textmate installed can have source code highlighted with his favorite theme.

Quick and dirty RubyGem to parse HSBC’s statement PDFs

Some helper methods to create pdfs and csvs ina a simple, tabellar notation. for PDF you can also add an header and a footer to each page.

Bazuro-PDF2DOCX allows convert from PDF to DOCX, through MS-WORD 2013 or later, using a macro

PDFTk wrapper to extract form fiels

Ensures links in PDFs are accessible

This gem provides a wkhtmltopdf executable and configures wisepdf, wicked_pdf, and pdfkit for ruby based applications running Windows

Add PDF 'images' as images in prawn documents

A set of convenience classes integrated with Ruby on Rails to transparently and flexibly convert html to PDF, in particular output nice PDFs direct from rhtml templates

This gem provides a simple interface to merge, stamp, split PDFs using https://github.com/ant31/pdfserve API.

Generate PDFs from HTML/CSS with middleman

Validate PDF files for PDF/A conformity.

Much longer explanation of the example!

Turn your Rails actions/views into PDFs without a web browser

pdf renderer for rails

Gem for rendering result PDFs

Examine all PDF files in Look up directories, remove password (if has one), rename and copy to a new directory using regular expressions.