PDFBox - Java PDF library

•    Java

Apache PDFBox is an open source Java PDF library for working with PDF documents. This library allows creation of new PDF documents, manipulation of existing documents and the ability to extract content from documents. It provides support for adding bookmarks, fonts, text extraction, Encryption, PDF printing and lot more.

PDFClown - PDF library

•    Java

PDFClown is a PDF library helps to generate, read and edit PDF. It helps to split and merge the PDF documents. It has support to add Images, Fonts, Barcodes, Bookmarks, Annotations, Form fields like checkbox, button, list box etc, Compression, text extraction.

iText - Java PDF library

•    Java

iText is one of the popular and widely used PDF library. It is used to generate PDF documents dynamically. Mostly web developers will love it to generate PDF documents and reports based on data from an XML file or a database and serves it to the browser. It has support of adding bookmarks, watermarks, Encryption, Form filling and lot more.

PDF Library - PDF manipulation in .NET

•    VBNET

A library for PDF manipulation implementing Adobe PDF standard version 1.7. This library allows to read PDF files and apply changes to them, it is written in .NET 2.0 using Visual Studio 2005. Writing and Parsing PDF is supported.

PDFJet - PDF library for Java and .NET

•    Java

PDFjet is a high performance PDF library for Java and .NET. It has support of drawing points, lines, box, polygons etc. It supports unicode text, embedding images, embedding hyperlinks and lot more. Its simple to use table class helps to generate flexible reports.

HexaPDF - A Versatile PDF Creation and Manipulation Library for Ruby

•    Ruby

HexaPDF is a pure Ruby library with an accompanying application for working with PDF files. It supports Creating new PDF files, Manipulating existing PDF files, Merging multiple PDF files into one, Extracting meta information, text, images and files from PDF files, Securing PDF files by encrypting them and optimizing PDF files for smaller file size or other criteria.

unipdf - Golang PDF library for creating and processing PDF files (pure go)

•    Go

UniDoc's UniPDF (formerly unidoc) is a PDF library for Go (golang) with capabilities for creating and reading, processing PDF files. The library is written and supported by FoxyUtils.com, where the library is used to power many of its services. Multiple examples are provided in our example repository https://github.com/unidoc/unidoc-examples as well as documented examples on our website.

TCPDF - PHP class for generating PDF

•    PHP

TCPDF is a PHP class for generating PDF documents without requiring external extensions. TCPDF Supports UTF-8, Unicode, RTL languages, XHTML, Javascript, digital signatures, barcodes and much more.

PDFEdit

•    C++

PDFedit is a free open source pdf editor and a library for manipulating PDF documents. It includes PDF manipulating library based on xpdf, GUI, set of command line tools and a pdf editor. You can use it to read, change and extract information from a PDF file. It is based on xpdf library.

PDFsharp - A .NET library for processing PDF

PDFsharp - A .NET library for processing PDF and MigraDoc Foundation - Creating documents on the fly

borb - Library for reading, creating and manipulating PDF files in Python

•    Python

borb is a pure python library to read, write and manipulate PDF documents. It represents a PDF document as a JSON-like datastructure of nested lists, dictionaries and primitives (numbers, string, booleans, etc).

jPod - PDF manipulating and rendering framework

•    Java

jPod is a PDF manipulating and rendering framework. It provides functionality to read, verify the document against the PDF specification. It also provides content stream and rendering framework. It could able to create new document and do incremental updates.

Pandoc - General Markup Converter

•    Haskell

Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. It an convert documents in markdown, reStructuredText, textile, HTML, DocBook, or LaTeX to HTML formats, Word processor formats, PDF and other markup formats.

docx4j - JAXB-based Java library for Word docx, Powerpoint pptx, and Excel xlsx files

•    Java

docx4j is a library which helps you to work with the Office OpenXML file format as used in docx documents, pptx presentations, and xlsx spreadsheets.

PDF Renderer - renders PDF documents to the screen

•    Java

PDF Renderer is a Java library which renders PDF documents to the screen using Java2D in to swing panel. It is capable to view the PDF, Converts it to PNG, View PDF in to 3D scene, Print preview support. It does not support to create or manipulate the PDF.

pdfextract - A tool and library that can extract various areas of text from a PDF, especially a scholarly article PDF

•    Ruby

A tool and library that can extract various areas of text from a PDF, especially a scholarly article PDF. It performs structural analysis to determine column bounds, headers, footers, sections, titles and so on. It can analyse and categorise sections into reference and non-reference sections and can split reference sections into individual references. The latest version is 0.1.1. Earlier versions are far less reliable.

Prawn - Fast, Nimble PDF Generation For Ruby

•    Ruby

Prawn is a pure Ruby PDF generation library that provides a lot of great functionality while trying to remain simple and reasonably performant. It provides support to do Vector drawing, including lines, polygons, curves, ellipses, etc. Extensive text rendering, Security features including encryption and password protection, PNG and JPG image embedding, with flexible scaling options and lot more.

Ghostscript - Document Rendering and Conversion

•    C

Ghostscript is a rendering and conversion engine for page description languages, including Postscript and PDF. It has ability to convert PostScript language files to many raster formats, view them on displays, and print them on printers that don't have PostScript language capability built in.

pdf-reader - The PDF::Reader library implements a PDF parser conforming as much as possible to the PDF specification from Adobe

•    Ruby

The PDF::Reader library implements a PDF parser conforming as much as possible to the PDF specification from Adobe. It provides programmatic access to the contents of a PDF file with a high degree of flexibility.

tabula-java - Extract tables from PDF files

•    Java

Extract tables from PDF files