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

APIs for manipulating various file formats based upon Open Office XML (ECMA-376) and Microsoft's OLE 2 Compound Document formats using pure Java. Apache POI is your Java Excel, Word and PowerPoint solution. We have a complete API for porting other OOXML and OLE 2 Compound Document formats and welcome others to participate.

Apache POI - Java API To Access Microsoft Document File Formats

Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. Pandoc can read Markdown, CommonMark, PHP Markdown Extra, GitHub-Flavored Markdown, MultiMarkdown, and (subsets of) Textile, reStructuredText, HTML, LaTeX, MediaWiki markup, TWiki markup, TikiWiki markup, Creole 1.0, Haddock markup, OPML, Emacs Org mode, DocBook, JATS, Muse, txt2tags, Vimwiki, EPUB, ODT, and Word docx.
 
Pandoc can write plain text, Markdown, CommonMark, PHP Markdown Extra, GitHub-Flavored Markdown, MultiMarkdown, reStructuredText, XHTML, HTML5, LaTeX (including beamer slide shows), ConTeXt, RTF, OPML, DocBook, JATS, OpenDocument, ODT, Word docx, GNU Texinfo, MediaWiki markup, DokuWiki markup, ZimWiki markup, Haddock markup, EPUB (v2 or v3), FictionBook2, Textile, groff man, groff ms, Emacs Org mode, AsciiDoc, InDesign ICML, TEI Simple, Muse, PowerPoint slide shows and Slidy, Slideous, DZSlides, reveal.js or S5 HTML slide shows. It can also produce PDF output on systems where LaTeX, ConTeXt, pdfroff, wkhtmltopdf, prince, or weasyprint is installed.

Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. Pandoc can read Markdown, CommonMark, PHP Markdown Extra, GitHub-Flavored Markdown, MultiMarkdown, and (subsets of) Textile, reStructuredText, HTML, LaTeX, MediaWiki markup, TWiki markup, TikiWiki markup, Creole 1.0, Haddock markup, OPML, Emacs Org mode, DocBook, JATS, Muse, txt2tags, Vimwiki, EPUB, ODT, and Word docx.

Pandoc - Universal markup converter

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.
 
It supports: 
<ul>
<li>Open existing docx/pptx/xlsx</li>
<li>Create new docx/pptx/xlsx</li>
<li>Programmatically manipulate docx/pptx/xlsx (anything the file format allows)</li>
<li>CustomXML binding (with support for pictures, rich text, checkboxes, and OpenDoPE extensions for repeats &amp; conditionals, and importing XHTML)</li>
<li>Export as HTML</li>
<li>Export as PDF (using Plutext's PDF Converter, or use docx4j-export-FO project)</li>
<li>Produce/consume Word 2007's xmlPackage (pkg) format</li>
<li>Apply transforms, including common filters</li>
<li>Font support (font substitution, and use of any fonts embedded in the document)</li>
</ul>

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.

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

SWFTools is a collection of utilities for working with Adobe Flash files (SWF files). The tool collection includes programs for reading SWF files, combining them, and creating them from other content (like images, sound files, videos or sourcecode). 
 
<ul>
 
<li>PDF2SWF
 A PDF to SWF Converter. Generates one frame per page. Enables you to 
 have fully formatted text, including tables, formulas, graphics etc. inside your
 Flash Movie. It's based on the <a href="http://www.foolabs.com/xpdf">xpdf</a> PDF
 parser from Derek B. Noonburg.
</li>
 
<li>SWFCombine
 A multi-function tool for inserting SWFs into Wrapper SWFs, contatenating SWFs, stacking SWFs
 or for basic parameter manipulation (e.g. changing size).
</li>
 
<li>SWFStrings
 Scans SWFs for text data.
</li>
 
<li>SWFDump
 Prints out various informations about SWFs, like contained images/fonts/sounds, 
 disassembly of contained code as well as cross-reference and bounding box data.
</li>
 
<li>JPEG2SWF
 Takes one or more JPEG pictures and generates a SWF slideshow from them. Supports
 motion estimation compression (h.263) for better compression of video sequences.
</li>
 
<li>PNG2SWF
 Like JPEG2SWF, only for PNGs.
</li>
 
<li>GIF2SWF
 Converts GIFs to SWF. Also able to handle animated gifs.
</li>
 
<li>WAV2SWF
 Converts WAV audio files to SWFs, using the
 <a href="http://www.mp3dev.org/mp3/">L.A.M.E.</a> MP3 encoder library.
</li>
 
<li>AVI2SWF
 Converts AVI animation files to SWF. 
 It supports Flash MX H.263 compression.
 Some examples can be found at <a href="examples.html">examples.html</a>.
 (Notice: this tool is not included anymore in the latest version, as ffmpeg or
 mencoder do a better job nowadays)
</li>
 
<li>Font2SWF
 Converts font files (TTF, Type1) to SWF. 
</li>
 
<li>SWFBBox
 Allows to read out, optimize and readjust SWF bounding boxes.
</li>
 
<li>SWFC
 A tool for creating SWF files from simple script files. Includes support for
 both ActionScript 2.0 as well as ActionScript 3.0.
</li>
 
<li>SWFExtract
 Allows to extract Movieclips, Sounds, Images etc. from SWF files.
</li>
 
<li>AS3Compile
 A standalone ActionScript 3.0 compiler. Mostly compatible with Flex.
</li>
 
</ul>

SWFTools is a collection of utilities for working with Adobe Flash files (SWF files). The tool collection includes programs for reading SWF files, combining them, and creating them from other content (like images, sound files, videos or sourcecode). 

SWFTools - Utilities to work with Adobe Flash files 

Hydra is designed to give the search solution the tools necessary to modify the data that is to be indexed in an efficient and flexible way. This is done by providing a scalable and efficient pipeline which the documents will have to pass through before being indexed into the search engine. Architecturally Hydra sits in between the search engine and the source integration. 
 
A common use-case would be to use Apache ManifoldCF to crawl a filesystem and send the documents to Hydra which in turn will process and dispatch processed documents to Solr for indexing.

Hydra is designed to give the search solution the tools necessary to modify the data that is to be indexed in an efficient and flexible way. This is done by providing a scalable and efficient pipeline which the documents will have to pass through before being indexed into the search engine. Architecturally Hydra sits in between the search engine and the source integration. 

Hydra - Distributed processing framework for search solutions

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.
 
It can read
[markdown] and (subsets of) [Textile], [reStructuredText], [HTML],
[LaTeX], [MediaWiki markup], and [DocBook XML]; and it can write plain
text, [markdown], [reStructuredText], [XHTML], [HTML 5], [LaTeX]
(including [beamer] slide shows), [ConTeXt], [RTF], [DocBook XML],
[OpenDocument XML], [ODT], [Word docx], [GNU Texinfo], [MediaWiki
markup], [EPUB] (v2 or v3), [FictionBook2], [Textile], [groff man] pages, [Emacs
Org-Mode], [AsciiDoc], and [Slidy], [Slideous], [DZSlides], or [S5] HTML
slide shows. It can also produce [PDF] output on systems where LaTeX is
installed.

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.

Pandoc - General Markup Converter

Documize Community is an open source modern, lightweight alternative to Confluence. It is built for technical and non-technical users, Designed to unify both customer-facing and internal documentation. It supports Organization through labels, spaces and categories. 

Documize Community - Modern Confluence alternative designed for internal & external docs, built with Golang + EmberJS

JODConverter automates conversions between office document formats using OpenOffice.org or LibreOffice. Supported formats include OpenDocument, PDF, RTF, HTML, Word, Excel, PowerPoint, and Flash. It can be used as a Java library, a command line tool, or a web application. 


JODConverter - Automates document conversions using OpenOffice

documents4j is a Java library for converting documents into another document format. This is achieved by delegating the conversion to any native application which understands the conversion of the given file into the desired target format.
 
documents4j comes with adaptations for MS Word and MS Excel for Windows what allows for example for the conversion of a docx file into a pdf file without the usual distortions in the resulting document which are often observed for conversions that were conducted using non-Microsoft products.

documents4j is a Java library for converting documents into another document format. This is achieved by delegating the conversion to any native application which understands the conversion of the given file into the desired target format.

documents4j - Java library for converting documents into another document format

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