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[312 users on Ohloh]
Evince is a document viewer for multiple document formats. It currently supports pdf, postscript, djvu, tiff and dvi. The goal of evince is to replace the multiple document viewers that exist on the GNOME Desktop with a single simple application.
[217 users on Ohloh]
Ghostscript is an interpreter for the PostScript language. A PostScript interpreter usually takes as input a set of graphics commands. The output is usually a page bitmap which is then sent to an output device such as a printer or display.

It also includes a graphics library and a PDF interpreter written in PostScript. It can act as a general vector graphics conversion engine, converting PostScript or PDF documents to other vector and raster formats.

[183 users on Ohloh]
A KDE PDF reader based on xpdf.
[93 users on Ohloh]
PDFCreator easily creates PDFs from any Windows program. Use it like a printer in Word, StarCalc or any other Windows application.
[88 users on Ohloh]
Scribus is a desktop page layout program with the aim of producing commercial grade output in PDF and Postscript.
[87 users on Ohloh]
teTeX is a complete TeX distribution for UNIX compatible systems, maintained by me, Thomas Esser. It is based on the web2c distribution which is currently maintained by Olaf Weber.

teTeX has been officially declared unmaintained by it's current maintainer, and users are suggested to change to TeX Live instead.

[69 users on Ohloh]
iText is a library that contains classes to generate documents in the Portable Document Format (PDF), XML, HTML, and RTF. It can also parse XML documents and convert them into any of these formats. Pages of existing PDF files can be imported and copied to new PDF documents.
[67 users on Ohloh]
JasperReports is a Java reporting library. XML report templates are used to generate ready to print documents using data from customizable data sources, including JDBC. The output can be delivered to the screen, printer, or stored in PDF, HTML, XLS, RTF, ODT, CSV, TXT and XML format.
Apache FOP
[60 users on Ohloh]
Apache FOP (Formatting Objects Processor) is a print formatter driven by XSL formatting objects (XSL-FO) and an output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, SVG, XML (area tree representation), Print, AWT, MIF and TXT.
Okular (KDE)
[50 users on Ohloh]
okular is an universal document viewer based on KPDF for KDE 4.

Its development began as part of Google's Summer of Code program. The description of the project is located at KDE Developer's Corner.

okular combines the excellent functionalities of KPDF with the versatility of supporting different kind of documents, like PDF, Postscript, DjVu, CHM, and others.
The document format handlers page has a chart describing in more detail the supported formats and the features s...

Apache Cocoon
[39 users on Ohloh]
Apache Cocoon is a web development framework built around the concepts of separation of concerns and component-based web development. Cocoon is "web glue for your web application development needs". It is a glue that keeps concerns separate and allows parallel evolution of all aspects of a web application, improving development pace and reducing the chance of conflicts.
eZ Publish
[38 users on Ohloh]
eZ Publish is an enterprise open source content management system and development framework with functionality for web publishing, intranets, e-commerce, extranets and portals.
[33 users on Ohloh]
ImpressCMS is a community developed Content Management System for easily building and maintaining a dynamic web site. Keep your web site up to date with this easy to use, secure and flexible system.

It is the ideal tool for a wide range of users: from business to community users, from large enterprises to people who want a simple, easy to use blogging tool. ImpressCMS is a powerful system that gets outstanding results!

Python API documentation generation tool
[30 users on Ohloh]
Epydoc is a tool for generating API documentation for Python modules, based on their inline documentation strings (docstrings). It produces HTML output (similar to the output produced by Javadoc) and LaTeX output. It supports four markup languages for documentation strings: Epytext, Javadoc, ReStructuredText, and plain text.
Wicket Stuff
[25 users on Ohloh]
Umbrella project for integrations of Wicket and other projects such as Jasper Reports, Hibernate, Freemarker. Also a home for small community contributions.
GNU LilyPond Music Typesetter
[22 users on Ohloh]
LilyPond is a music typesetter. It produces beautiful sheet music using a description file as input. LilyPond is part of the GNU Project.
[21 users on Ohloh]
TeXShop is a TeX previewer for Mac OS X, written in Cocoa. Since pdf is a native file format on OS X, TeXShop uses "pdftex" and "pdflatex" rather than "tex" and "latex" to typeset; these programs in the standard teTeX distribution of TeX produce pdf output instead of dvi output.
[21 users on Ohloh]
Tags: pdf tex latex dvi
The main purpose of the pdfTeX project is to create and maintain an extension of TeX that can produce PDF directly from TeX source files and improve/enhance the result of TEX typesetting with the help of PDF. When PDF output is not selected, pdfTEX produces normal DVI output, otherwise it generates PDF output that looks identical to the DVI output.
An important aspect of this project is to investigate alternative justification algorithms (e. g. a font expansion algorithm akin to t...
[20 users on Ohloh]
Kile is a user friendly TeX/LaTeX editor for the KDE desktop environment. It simplifies the creation of LaTeX documents.
[19 users on Ohloh]
SumatraPDF is a PDF viewer/reader for Windows.