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. It has <A HREF="http://pdfbox.apache.org/userguide/dot_net.html">.NET support</A>. 

 Form filling is one of most important feature. It helps to fill in form data FDF and XFDF. It has command line utlities for most of the jobs. For example PDFToImage utility create an image for every page in the PDF document. 
 
 PDF documents could be splitted to multiple documents and also multiple PDF documents could be merged to one. Lucene Search Engine is integrated to do full text search.

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.

PDFBox - Java PDF library

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. 

 iText helps to convert PDF to text and it is also capable to generate PDF from XML and HTML. It could digitally sign the document.

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.

iText - Java PDF library

Zettlr is an Electron-based app, A Markdown Editor for the 21st century. With Zettlr, writing professional texts is easy and motivating: Whether you are a college student, a researcher, a journalist, or an author — Zettlr has the right tools for you. It has a revolutionary search algorithm with integrated heatmap. It is available in over a dozen languages



Zettlr - A Markdown Editor for the 21st century.

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. 

Ghostscript - Document Rendering and Conversion

PDF.js is a Portable Document Format (PDF) viewer that is built with HTML5. PDF.js is community-driven and supported by Mozilla Labs. Our goal is to create a general-purpose, web standards-based platform for parsing and rendering PDFs.

PDF.js - PDF Reader in JavaScript

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.

Prawn - Fast, Nimble PDF Generation For Ruby

PDFKit is a PDF document generation library for Node and the browser that makes creating complex, multi-page, printable documents easy. The API embraces chainability, and includes both low level functions as well as abstractions for higher level functionality. The PDFKit API is designed to be simple, so generating complex documents is often as simple as a few function calls.

PDFKit - A JavaScript PDF generation library for Node and the browser.

jsPDF is a leading HTML5 client solution for generating PDFs. It is perfect for generating PDFs in JavaScript. 

jsPDF - The leading HTML5 client solution for generating PDFs

PDFsharp is the Open Source .NET library that easily creates and processes PDF documents on the fly from any .NET language. The same drawing routines can be used to create PDF documents, draw on the screen, or send output to any printer. Neither Adobe's PDF Library nor Acrobat are required. Its features include:
 <ul><li>Creates PDF documents on the fly from any .NET language<1/li><li>Easy to understand object model to compose documents</li><li>One source code for drawing on a PDF page as well as in a window or on the printer</li><li>Modify, merge, and split existing PDF files</li><li>Images with transparency (color mask, monochrome mask, alpha mask)</li><li>Newly designed from scratch and written entirely in C#</li><li>The graphical classes go well with .NET </li></ul>

PDFsharp is the Open Source .NET library that easily creates and processes PDF documents on the fly from any .NET language. The same drawing routines can be used to create PDF documents, draw on the screen, or send output to any printer. Neither Adobe's PDF Library nor Acrobat are required.

PDFSharp - Create and process PDF in .NET

PDF Chain is a graphical user interface for the PDF Toolkit (pdftk). The GUI supports all common features of the command line tool in a comfortable way. PDF Chain generates a command for the PDF Toolkit from the GUI settings and executes it on the system. Therefore the PDF Toolkit must be already installed on the system. 
 
It can concatenate selected pages of various PDF documtents into one, Burst a PDF document into single pages, Print a background or stamp on each page of a PDF document, Set permissions on PDF output documents and lot more.

PDF Chain is a graphical user interface for the PDF Toolkit (pdftk). The GUI supports all common features of the command line tool in a comfortable way.  PDF Chain generates a command for the PDF Toolkit from the GUI settings and executes it on the system. Therefore the PDF Toolkit must be already installed on the system. 

PDF Chain - Graphical user interface for the PDF Toolkit (PDFtk)

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). 



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


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 check box, button, list box etc, Compression, text extraction. It has .NET version developed for mono. 
 
 Source forge: <A HREF="http://sourceforge.net/projects/clown/" target="_blank">http://sourceforge.net/projects/clown/</A>

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.

PDFClown - PDF library

PDFsam basic is a simple, platform independent software designed to split, merge and rotate pdf files. It can split your pdf documents (into chapters, single pages, etc.). It can merge many pdf documents or subsections of them. It helps to visually reorder pages of a selected pdf document.

PDFSam - PDF Split and Merge

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.

PDFEdit 

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.

HexaPDF - A Versatile PDF Creation and Manipulation Library for Ruby

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