W3C Open Source Software

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About W3C Software
The natural complement to
W3C specifications
is running
code. Implementation and testing is an essential part of specification
development and releasing the code promotes exchange of ideas in the developer
community.
All W3C software is
certified
Open
Source/Free Software.
(See the
license
b6+ version 1.166
2026-01-24
B6+
, the slide framework has some improvements:
By default, b6+ does not set role=application anymore. In most
screen readers, this results in better accessibility, while still
allowing b6+'s keys to work.
Still for users of screen readers: The N key now cycles through
speaking the speaker notes, the next slide, the current incremental
item (if any), and the current slide.
B6+ now tries to avoid that invisible elements in a live region
accidentally get focus.
When a table of contents (ToC) is opened (with the C key), the
current slide is highlighted in the ToC.
When a ToC is open, the Escape key now closes that ToC, rather
than exiting full-screen mode and stopping the slide show. (So far
only on recent Firefox and Chrome.)
Keys to navigate the slides now work even if an element on a slide
has the focus (unless the key has a function in that element).
The duration of automatic slide shows can now be a fractional
number of seconds, minutes or hours (e.g.: “10.3s”).
Automatic font size reduction (class “textfit”) and
image scaling (class “autosize”) now work also if the
styles for slide mode and index mode differ.
A new custom property “--progress0” is available for
style sheet writers. It is similar to the “--progress”
property, but starts at 0 for the first slide.
News Archive
b6+ version 1.154
2025-11-21
B6+
, the slide framework, has some improvements, especially for
accessibility:
Users of screen readers can press the N key to hear the speaker
notes for the current slide. Press N a second time to again hear the
contents of the slide itself.
Bug fix, for users of screen readers: When going backwards
instead of forward through a list of incrementally displayed
elements, the current element wasn't spoken. Now it is.
B6+ sets the ARIA attribute role=application. But it is not
clear if that leads to the best user interface with all screen
readers. So, as an experimental feature, you can tell b6+ to not set
that attribute.
Improvements to the function to toggle comments on/off in index
mode, so that the display jumps less when comments are turned on or
off.
News Archive
b6+ version 1.147
2025-05-09
B6+
, the slide
framework, has a number of new features:
When a slide contains a video or audio, it is rewound each time
the slide is displayed. And when it is set to “autoplay”,
it also starts automatically.
Setting the class “textfit” on a slide causes b6+ to
automatically reduce the font size on that slide if needed to make it
fit on the slide. The class can also be set on the
BODY
element.
Similarly, the class autosize can be set on images, to let b6+
try and scale them down and avoid that a slide overflows.
If there is an external screen attached, b6+ will automatically
try to use that when going into slide mode. (Not supported by all
browsers.)
A button and a key press allow toggling the display of speaker
notes in index mode. The notes are initally hidden, but that can be
reversed with a class or a URL parameter.
News Archive
b6+ version 1.132
2025-02-21
B6+
, the slide
framework, now includes a
guide for style
sheet writers
, to help with making new slide styles.
News Archive
html-xml-utils 8.7
2025-02-16
Version 8.7 of the
HTML-XML-utils
fixes a bug in
hxnormalize that caused some lines in the output to be shorter than
requested by the -l option.
News Archive
b6+ version 1.124
2025-02-13
B6+
, the slide
framework, has two new features:
B6+ supports a simple form
of
“slipshow”
presentations: Rather than putting all
topics on separate slides, you add them one by one to a long
“scroll” that automatically moves earlier topics up to make room
for the next one. (See
an
example
.)
B6+ allows drawing on the slide with the mouse, e.g., to
underline text or circle some items. This could replace a laser
pointer and is also useful when screen-sharing in a video
conference.
News Archive
News Archives:
2026
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
Server-side
Apache patches
Jigsaw
Hcalproxy
Browse, Parse, View
Amaya
CWM
IsaViz
Authoring tools
Amaya
HTML Slidy
b6+
Validation, lint
Charlint
CSS Validator
Link Checker
Log Validator
mobileOK checker
Markup Validator
RDF Validator
HTML Tidy
XSV
I18n checker
WPT
Manipulation, Libraries
csvtotab/tabtocsv
DTD2Schema
eot-utils
Ical2html
HTML-XML-utils
libwww
mail-transcode
RDFPic
rdjpgxmp, wrjpgxmp, xmptool
recut
gf-markdown-awk
IRC, meeting tools
AgendaBot
scribe.perl
zakim-monitor
GHURLBot a.k.a. “gb”
Browse W3C's Open Source Software
Amaya - a Web
browser/editor
First released Feb '97, Amaya is not just a browser, but a
hypertext
editor
. It's a test-bed for the design of embedded objects,
stylesheets, math, structured graphics, and more.
Apache patches
Our contributions to the Apache HTTP server cover bug patches and
extensions to the HTTP perl test framework as needed. We have applied all
of these patches to our production servers.
Charlint
Charlint, aka "Charlie", is a perl script that allows you to validate
or normalize Unicode (UTF-8) data according to the
Character Model for the World Wide Web
W3C
Working Draft.
CSS Validator
The W3C
CSS Validation
Service
, also known as CSS validator, is a popular free online
service to find problems in
CSS
style sheets
used by your HTML pages. The CSS Validator is also
available for
Cwm
Cwm is a general-purpose data processor for the
semantic web
. It is a forward chaining reasoner
which can be used for querying, checking, transforming and filtering
information. Its core language is
RDF
, extended to
include rules, and it uses RDF/XML or N3 serializations as required.
DTD2Schema
A Conversion Tool from DTD to XML Schema
eot-utils
The eot-utils are the two programs
mkeot
and
eotinfo
The former creates an
EOT
(Embedded OpenType)
file from an OpenType or TrueType font and the URLs of one or more Web
pages. Unlike Microsoft's
WEFT,
mkeot
is a command-line utility.
mkeot
doesn't subset a
font and doesn't currently compress the font data.
mkeot
respects the TrueType “embedding bits.” The
eotinfo
program displays the contents of an EOT header in a human-readable way.
The programs were tested on Linux (Debian 5 “Lenny”) and Mac
OS X (10.5 “Snow Leopard”) but are expected to work on more
systems.
HTML
Slidy
A Web-based framework for creating accessible slide shows with simple
markup, and operated like Microsoft PowerPoint. Each presentation is
marked up as a single document with links to the slideshow style sheet
and script. Each slide is enclosed in a div element with class="slide".
The framework includes support for handout notes, incrementally revealing
bullet points and graphics overlays, different backgrounds for different
slides (div's with class="background"), and guidance on using SVG for
anti-aliased graphics that scale with the window size.
b6+
Another framework for HTML slide shows. b6+ is a script in
JavaScript, which is attached to an HTML file to display the file
as a series of slides. Each slide is an element (
div
section
or similar) with a class of
slide
(this format is compatible with the
Shower
framework), but it is also
possible to just start a slide with an
h1
element
without wrapping the slide in an element. The slide then ends at
the next
h1
. See the
documentation
(which is itself a slide show) for its other
features.
HTML
Tidy
HTML TIDY is a free utility for fixing HTML mistakes automatically and
tidying up sloppy editing into nicely laid out markup. It also works
great on the atrociously hard to read markup generated by some
specialized HTML editors and conversion tools, and can help you identify
where you need to pay further attention to making your pages more
accessible to people with disabilities. Tidy further provides a simple
way to convert HTML to well formed XML, see
WD-html-in-xml
HTML-XML-utils
A number of simple
C programs for
manipulating HTML & XML:
number headings, make a table of
contents, make an index, manage bibliographic references (a simple
implementation of refer(1) for HTML), list all links, create
cross-references, extract elements that match a (CSS) selector, etc. Most
are meant to be used in a Unix pipe or in shell scripts.
Ical2html -
tools for icalendar files
The tools consist of three programs:
ical2html
reads an iCalendar (.ics) file, extracts all events
between certain dates and of certain categories and creates an HTML page
with monthly calendars;
Icalfilter
filters out events of a given
category;
icalmerge
merges two or more iCalendar files, keeping
only the most recent versions of duplicate events.
IsaViz
IsaViz is a visual environment for browsing and authoring
RDF
models represented as graphs.
Jigsaw - the Advanced Web
Server
In June 1996, the release of Jigsaw demonstrated object-oriented web
server design, written in Java. While it supports HTTP 1.1, traditional
file-based resources, and CGI, its strength lies in its resource-based
architecture. On this architecture, it supports advanced proxy caching
features including ICP, Servlets, PICS, collaborative authoring, and
more
Libwww - the W3C Protocol
Library
Libwww is a highly modular, general-purpose client side Web API written
in C for
Unix and Windows (Win32)
It's well suited for both small and large
applications
. Pluggable
modules provided with libwww
include
complete
HTTP/1.1
(with caching,
pipelining, PUT, POST, Digest Authentication, deflate, etc.),
MySQL logging
FTP
HTML/4
XML
(expat),
RDF
(SiRPAC), and much more. The
purpose of libwww is to serve as a testbed for protocol experiments.
Note:
In addition to the W3C Software License, libwww
is covered by a
specific
notice
, which includes CERN.
Link Checker
The W3C Link Checker checks that all the links in your HTML document
are valid. There is a command-line interface and an
online version
. The Link
Checker can
easily be
installed
on one's server.
Log Validator
The
Log Validator
is a web server
log analysis and validation tool: it can help web content managers find
and fix the most frequently accessed invalid documents on their Web site.
It is based on a
flexible perl
library
that can be used to process lists of Web documents for
validation or other tasks.
Markup Validation Service
The W3C Markup Validation Service, also known simply as “
HTML Validator
” is a free online
service that helps check Web documents in languages such as HTML, XHTML,
SVG, MathML, etc. Its
source
code
is also available, and it is relatively easy to
install
on a number
of platforms.
mobileOK checker
library
The W3C mobileOK checker Java library helps building applications that
can assess whether a Web page is
mobileOK Basic
highlighting potential problems it would have to be used on a mobile
device (such as a phone or a PDA). It serves as a successor to the
mobile web best
practices checker
RDFPic
RDFPic
is a tool to embed an
RDF description of a picture into the picture itself, as described by
Describing and retrieving photos
using RDF and HTTP
. The
version in
CVS
supports
XMP.
RDF Validator
The
RDF Validator
checks
the syntax of RDF documents, and can produce a graph of any RDF data. Its
java code
can
run as a java servlet with jetty, tomcat or Jigsaw.
Installation
instructions for Jetty or Tomcat
are available on the ESW Wiki.
XSV
XSV
is a validator for
W3C XML Schema, available both for download in source and executable
formats, and
online
web-platform-tests (WPT)
web-platform-tests is a W3C-coordinated effort to build a cross-browser testsuite for the majority of the Web platform.
Its goal is to help achieve interoperability among different implementations.
HcalProxy
Hcalproxy runs as a personal proxy and converts (remote) HTML with
hCalendar
microformat
mark-up to
icalendar.
For example, if
is an HTML
document, then
is an
icalendar document with all events from that HTML document.
rdjpgxmp, wrjpgxmp,
xmptool
rdjpgxmp and wrjpgxmp extract and insert XMP data in JPEG (JFIF) files.
xmptool can print the value of a particular property in an XMP file,
delete a property from an XMP file, or insert a property/value pair into
an XMP file.
Recut
Recut is like the well-known
cut
utility in
Unix, but it can also duplicate and reorder fields. E.g., if you
do
cut -f2,2,1 myfile
you get fields 1 and 2 from
myfile. The order is ignored and so are duplicates. But with
recut -f2,2,1 myfile
you get field 2, field 2 again,
and field 1, in that order.
Unicorn
Unicorn is W3C's unified validator, which helps people improve the
quality of their Web pages by performing a variety of checks. Unicorn gathers
the results of the popular HTML and CSS validators, as well as other useful services.
csvtotab & tabtocsv
Csvtotab converts files of tabular data in comma-separated
values (CSV) to tab-separated values, tabtocsv does the opposite.
They are intended to be compliant with
Model for Tabular Data and
Metadata on the Web.
mail-transcode
mail-transcode can convert e-mail messages between
quoted-printable, base64 and binary encoding, which could be
useful in e-mail filters.
Internationalization checker
This checker performs various tests on a Web page to determine
its level of internationalization-friendliness. It also
summarizes key internationalization information about a page,
such as character encoding and language declarations.
AgendaBot
AgendaBot is an IRC robot that watches a channel, looking for
lines of the form
agenda:
URL
. It tries to
parse the document at that URL and extract an agenda, which it
then prints on IRC. It understands a few different formats.
AgendaBot is especially useful as a complement to
Zakim
(but doesn't depend
on Zakim).
scribe.perl (v2)
scribe.perl is a Perl script that converts IRC logs (such as
those made by
RRSAgent
, but
also other IRC clients) to nicely formatted HTML. It knows about
various conventions that are used by W3C groups to describe action
items, agenda items, list of participants, etc.
zakim-monitor
Zakim-monitor is a (Perl) program that displays a table in a
text terminal (such as an xterm or a MacOS Terminal) with the
current agenda, speaker queue and open questions from an IRC
channel that is managed by
the
Zakim IRC bot
. It
does that by connecting to the IRC channel and watching for
messages from the Zakim bot. After each message, it updates the
information displayed in the terminal.
GHURLBot a.k.a “gb”
GHURLBot (for “GitHub URL Bot”) is an experimental
IRC bot that usually runs under the name “gb”. It can
find the URLs of GitHub issues, look up issue
summaries and create new issues and action items. (An
“action item” is an issue that has an assigned person
and a deadline.) It does a similar job
as
Trackbot
, but for GitHub
issues, rather than Tracker issues.
gf-markdown-awk
A library for Awk programs that provides functions to
convert
GitHub-flavored
markdown
to HTML, to inline HTML, or to plain text.
Past Projects
Here is the list of
Past Open Source
Projects
developed at W3C.
Get involved! Contribute to W3C Open-Source Software
W3C software is free and open source: the software is made primarily
by
people of the Web community, for the Web community
There are many ways to get involved:
Help Others
Great communities make great tools, and with only a few minutes of your time
you can join the mailing-lists associated with W3C open source projects (such
as
www-validator
for
the markup validator or
www-validator-css
for the CSS validator) and participate in discussions and user support.
A lot of W3C software have a specific user discussion mailing-list (see each
projects for details), some also have IRC (chat) channels, such as the
#validator
channel on the
irc.freenode.net
for
discussions on W3C validation services.
Write code
Developers are welcome to get involved by contributing code. either to
existing projects
(see list above and check each project's
documentation for contact e-mail information), or
proposed future software
Patches and
bug fixes
are always
welcome, and developers willing to get seriously involved will generally get
commit access after a proving period.
As explained
below
, all of W3C software source is
freely available
, developers are
encouraged to get the source for the projects they care about and start hacking
right away.
Read the
IPR FAQ
on software contribution
if you intend to contribute code. Note that as
this license is GPL compatible, it is possible to redistribute software based
on W3C sources under a GPL license.
Send Feedback
Code is not the only way to get involved in making W3C software better.
Testing, bug reports, suggestions, or help in creating good documentation are
equally important! Most project will have a
Feedback
page, and you can
report bugs, test cases and patches on our
Bugzilla
Donate
All the tools listed on this page are free and open source, but hosting,
maintaining and developing them often costs a lot. With your support through
the
Validator Donation Program
or the
W3C Supporters Program
we can build even better tools.
Download and Check source code
Most W3C software is available directly
from our CVS base
or in our
Mercurial repository
. You can browse the content
and history of either through their respective web interfaces.
See the documentation of each software for specific instructions for
download and installation.
Some software that was formerly available via FTP at
ftp.w3.org
has been
moved to our web site
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