PDF::Core is used by Prawn to render PDF documents. It provides low-level format support.

Prawn is a fast, tiny, and nimble PDF generator for Ruby

Font Metrics Parser for the Prawn PDF generator

This library provides LZW encoding and decoding capabilities with no dependencies and a reasonably fast speed. It is highly configurable, supporting both constant and variable code lengths, custom alphabets, usage of clear/stop codes... It uses LSB packing order. It is compatible with the GIF specification, and comes equipped with several presets. Eventually I'd like to add compatibility with other standards, such as the ones used for UNIX compress, PDF and TIFF.

Wicked PDF uses the shell utility wkhtmltopdf to serve a PDF file to a user from HTML. In other words, rather than dealing with a PDF generation DSL of some sort, you simply write an HTML view as you would normally, and let Wicked take care of the hard stuff.

A thin wrapper above Prawn that makes it easier to build compentized PDFs

Creates polish invoices and proforms as HTML or PDF files

Latexpdf is a renderer for rails which compiles Tex files with ERB to a PDF using xelatex by default so that it supports Unicode.

Use GrabzIt to convert HTML or URL's into images, PDF, videos, rendered HTML or DOCX. These captures have highly customizable options include altering quality, delay, size, browser type, geographic location and much more. Additionally GrabzIt can even convert HTML tables on the web into a CSV or Excel spreadsheet. As well as enabling online video's to be converted into animated GIF's.

An Adobe PDF Services Ruby SDK provides APIs for creating, combining, exporting and manipulating PDFs.

Write a resume in markdown, style it with CSS, edit it with a live server and distribute it as either HTML or PDF.

A gem that provides a client interface for the Gotenberg PDF generate service

DANFE pdf generator for Brazilian invoices.

A framework for creating e-books from Markdown using Ruby. Using the Prince PDF generator, you'll be able to get high quality PDFs. Also supports EPUB, Mobi, Text and HTML generation.

Generate PDF with Google Cloud Function.

Clean Ruby implemenentation of a HTML to PDF converter based on WebKit, WebKit2GTK+ and GirFFI

pdfmult is a command line tool that rearranges multiple copies of a PDF page (shrunken) on one page. It is a wrapper for pdflatex with the pdfpages package.

Ruby Monthly Calendar, Console and pdf

transforms EML files to PDF

This gem allows testing frameworks such as Test::Unit, RSpec and Minitest to perform PDF matching tests with the pdf_matcher gem.