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

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

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

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

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

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. You can also modify existing PDF files by changing their document information properties, add text annotations to a page, add JPEG images to a page, change page rotation and erase the whole content of a page.

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.

PDF Library - PDF manipulation in .NET

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. 

 <A HREF="http://opensource.intarsys.de/home/en/index.php?n=JPodRenderer.HomePage" target="_blank">jPod Renderer</A>, a complete rendering implementation for AWT and SWT with lot of support for platform specific tasks. It has pluggable image conversion and font handling support.

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.

jPod - PDF manipulating and rendering framework

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. Sourceforge location: <A HREF="http://sourceforge.net/projects/tcpdf/" target="_blank">http://sourceforge.net/projects/tcpdf/</A>

 <ul>
 <li>no external libraries are required for the basic functions</li><li>all standard page formats, custom page formats, custom margins and units of measure</li><li>UTF-8 Unicode and Right-To-Left languages</li><li>TrueTypeUnicode, OpenTypeUnicode, TrueType, OpenType, Type1 and CID-0 fonts</li><li>methods to publish some XHTML code, Javascript and Forms</li><li>images, graphic (geometric figures) and transformation methods</li><li>1D and 2D barcodes including QR-Code ad PDF417</li><li>Grayscale, RGB, CMYK, Spot Colors and Transparencies</li><li>automatic page header and footer management</li><li>document encryption and digital signature certifications</li><li>transactions to UNDO commands</li><li>PDF annotations, including links, text and file attachments</li><li>text rendering modes (fill, stroke and clipping)</li><li>multiple columns mode</li><li>bookmarks and table of content</li><li>text hyphenation</li><li>automatic page break, line break and text alignments including justification</li><li>automatic page numbering and page groups</li><li>move and delete pages</li><li>page compression</li><li>font subsetting</li>
</ul>

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.

TCPDF - PHP class for generating PDF

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. 

 It is compatible with the Google App Engine. Its open source edition has very less feature whereas Commercial edition has lot more.

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.

PDFJet - PDF library for Java and .NET

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