<oxygen/> xml Editor

Price: approx. $349 (Professional) and $449 (Enterprise)

http://www.oxygenxml.com

XMetaL

Price: approx. €1175 (XMetaL Author Enterprise)

http://www.justsystems.com

MadCap Flare, MadCap Blaze

Price: approx. $899 (Flare), $699 (Blaze)

http://www.madcapsoftware.com

Adobe FrameMaker

Price: approx. $999; also available as part of the Technical Communication Suite

http://www.adobe.com

Arbortext

Price: upon request

http://www.ptc.com

UltraXML

Price: upon request

http://www.webxsystems.com

Serna Editor

Price: approx. $749; also free Open Source version with limited set of features available

http://www.syntext.com

Xopus

Web based WYSIWYG XML Editor with support for DITA.

Price: starting at approx. €900

http://xopus.com

DITA Storm Suite

Standalone and embeddable DITA XML editors.

Price: starting at approx. $475

http://www.inmediusdita.com

XMLSpy

Price: approx. €129 up to €799

http://www.altova.com

Stylus Studio

Price: approx. $99 up to $595

http://www.stylusstudio.com

XMLmind XML Editor

Price: approx. €230; there is also a free personal edition available (limited set of features; non-commercial use only)

http://www.xmlmind.com

XML Copy Editor

Versatile XML editor, primarily focused on text editing. Built-in spell-checker and support for XHTML, XSL, DocBook, XSLT, XPath.

Price: free (Open Source)

http://xml-copy-editor.sourceforge.net

XML Notepad (Freeware, Windows)

Basic XML editor from Microsoft.

Proce: free

http://www.microsoft.com

Jaxe

Java-based XML editor with document-oriented, customizable user interface

Price: free (Open Source)

http://sourceforge.net/projects/jaxe

DITA Open Toolkit (Open Source)

Transforms XML DITA content into deliverable formats such as HTML and PDF.

Price: free (Open Source)

http://sourceforge.net/projects/dita-ot/

Apache FOP

Print formatter driven by XSL formatting objects (XSL-FO). Primary output target is PDF.

Price: free (Open Source)

http://xmlgraphics.apache.org/fop/

Apache Forest

Publishing framework that transforms input from various sources into a unified presentation in one or more output formats.

http://forrest.apache.org/

Antenna House XSL Formatter

Price: approx. $1250 (Standard) and $300 (Lite)

http://www.antennahouse.com

RenderX XEP Engine

Price: approx. $360

http://www.renderx.com

XMLmind XSL-FO Converter

XSL-FO processor. Converts XSL-FO to RTF, WordprocessingML (can be opened in Word 2003+), Office Open XML and OpenOffice.

Price: approx. €150; free personal edition for non-commercial use

http://www.xmlmind.com

Saxonica

XSLT and XQuery processing tools.

Price: free, Open Source Home Edition; commercial Professional and Enterprise Editions (approx. £50 / £300)

http://www.saxonica.com

XF Designer

Template editor with XSL-driven WYSIWYG interface.

Price: approx. $995

http://www.ecrion.com

xDoc

Transform Word content to standard and custom XML schemas / DTDs, such as DocBook and DITA.

Price: upon request

http://www.cambridgedocs.com

Stilo Migrate

Enables users to upload documents in proprietary formats, including Word and FrameMaker and converts them to DITA XML.

Price: pay-as-you-use pricing upon request

http://www.stilo.com

DITA2wiki

Publishes DITA content (maps and topics) to a wiki.

Price: free (Open Source)

http://sourceforge.net/projects/dita2wiki/

DITA to WordPress Import Tool

Import module that takes the two-pane Web help output from the DITA Open Toolkit and imports the hierarchy of XHTML pages into WordPress.

Price: free (Open Source)

http://zed1.com/journalized/wordpress-plugins/dita-to-wordpress-import-tool/

Digital Assembly Line (DAL):

Enables creation of complex documents from multiple inputs into one cohesive output.

Price: approx. $1250

http://www.ecrion.com

DITA Exchange

Microsoft SharePoint-based DITA collaboration platform. Writers and subject-matter expert can participate in writing DITA topics and compose and publish DITA maps without special XML or DITA skills.

Price: approx. €59 per user per month

http://www.dita-exchange.com

DocZone DITA

Hosted XML content management and single-source publishing solution, combined with server-based translation memory.

Price: approx. $395 per concurrent user per month

http://www.doczone.com

Bluestream XDocs XML CCMS

DITA component content management system. Includes both an XML editor and a publishing engine, making it an out-of-the box DITA CMS.

Price: $5000 for up to 3 authors

http://www.bluestream.com

If you only need revision control (version control):

TortoiseSVN

Not integrated into any specific IDE. Can therefore be used for any data.

Price: free (Open Source)

http://tortoisesvn.net

If you need a full-featured (Web) Content Management System:

Typo 3

http://typo3.org

Joomla!

http://www.joomla.org

Plone

http://plone.org

Daisy

http://cocoondev.org/daisy/index.html

Apache Lenya

Although mostly used as a web content management system, Lenya can also be used to manage printed documents.

http://lenya.apache.org/

ATutor

Web-based Learning Content Management System (LCMS).

http://www.atutor.ca/

If you want to publish a blog:

WordPress

Calls itself "a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability".

http://wordpress.org

Thingamablog

Unlike most blogging solutions, does not require a third-party blogging host, a cgi/php enabled web host, or a MySQL database.

http://thingamablog.sourceforge.net

dokuwiki

http://www.dokuwiki.org

MediaWiki

http://www.mediawiki.org

TWiki

http://twiki.org/

Confluence

Commercial Enterprise Wiki.

Price: starting at $10

http://www.atlassian.com/software/confluence/

WikiMatrix

Provides a comprehensive comparison of different wikis.

http://www.wikimatrix.org/