HTML/XHTML

w3schools HTML tutorial.
w3schools XHTML tutorial.
w3c HTML 4.01 Reference.
w3c list of valid DTDs to use in your documents.
HTML Dog HTML and CSS tutorials, references, articles and news.
iframe tutorial and usage from Webmonkey.
WDVL 4.0 tag and attribute reference.
HTML Meta Tags a dictionary of HTML META tags. Usage and resources.
Caching Tutorial learn about web caches and how (and how not) to control them.

CSS

Cascading Style Sheets home page at w3.
w3schools CSS2 Reference usage, syntax, browser compatibility, and online examples.
CSS Reference based on MSDN and WC3 CSS reference from Wsabstract.
MSDN CSS Reference for Internet Explorer.
MSDN CSS Demo Coding Tool with copy and paste output.
MSDN filters and transitions demo tool.
MSDN scroll bar color tool.
Scroll bar demonstration tool from site experts.
Code Style CSS style guide. Articles, usage, faqs and style tips.
Glish introduction to CSS, layout techniques, examples and demonstrations.
Bonrouge css layouts and related items.
House of Style a collection of resources for web developers who want to work with Cascading Style Sheets and other web standards such as HTML 4.01 and XHTML 1.0.
css-discuss Wiki usage and tips on writing good style sheets.
CSShark faqs, tutorial, tips and tricks.
Nemesis Project a collection of layout templates.
BlueRobot layout reservoir.
Ruthsarian Layouts two and three column examples.
Selectoracle examine selectors. Parsing tool accepts URL's or blocks of code.
Zen Garden a demonstration of what can be accomplished with css based design.
CSS Play experiments with cascading style sheets.

JavaScript

w3schools JavaScript tutorial.
w3 document object model core.
Web Monkey collection of code fragments, function packages, and Web editor extensions.
Webteacher JS tutorial
DevGuru JavaScript quick reference.
MSDN JScript Language Reference
Mozilla Gecko dom reference index.
JavaScript 2.0 reference from Mozilla.
JavaScript Kit reference. Objects, properties, and methods. Also includes explanations and examples.
WebReference javascript tips. Column 5 Patten Matching and Regular Expressions and Column 36 JavaScript and frames.
Voodoo's introduction to Javascript (version 5).
irt.org JavaScript Prorammer's Reference ( book in html )
irt.org JavaScript FAQ Knowledge Base
Mozilla Dev guides you through the AJAX basics and gives you two simple hands-on examples to get you started.
JavaScript Archive from web developer.
JavaScript Source copy and paste scripts to use or learn from.
JavaScriptCity freescripts, listed by category.
JavaScript 101 tutorial from about.com.
Focus on JavaScript articles and examples from about.com.
comp.lang.javascript FAQ
HTML Goodies JavaScript Primers

DHTML

GetElementById DHTML scripts and tutorials.
Dynamic Drive scripts and components archive. Includes a faqs section.
DynAPI Cross-Browser DHTML a cross-browser javascript library used to create Dynamic HTML components on a web page.
Javascript Kit tutorials grouped by topic.

PHP

PHP.net "official" home page. Introductory tutorial, docs, faqs, updates.
w3c learn about PHP, and how to execute scripts on your server.
PHPBuider articles, snippet code library, docs and resources.
WebMonkey PHP beginners tutorial.
WebMonkey PHP/MySQL inductory tutorial.
DevShed articles and script help.
PHP Classes downloads grouped by classes.
O'Reilly PHP DevCenter
Ming - SWF / PHP usage, scripts and development information.
Basic Ming Lessons an introductory tutorial and an example swf generator.
Nexen PHP script library.
Evil Walrus forums, code archive and articles.
PX the PHP code exchange. Script library.
PHP Resource Index script library, functions and classes, documentation and communities.
Zend PHP Development tools for development, protection, and scalability of PHP applications.
PHP Faqts knowledge base with links to tutorials and documentation.
Devshed developer articles and forums.
Hudzilla Practical PHP Programming.
Firepages phpdev bundles, downloads, forums.
Blazony PHP and MySQL tutorial.
RegExLib regular expression library with 815 expressions indexed from contributors around the world. Includes a testing area.

Perl/Cgi

CPAN the Comprehensive Perl Archive Network home page.
Mirror of CPAN.
CPAN the Search Site.
Perl.com Articles, Weblogs, Books, Learning Lab and News.
Perl Docs index from Theoretical Physics at the University of Winnipeg.
PerDoc the Perl Docs in HTML.
Perl.org Perl directory.
Perl 5 Reference Guide HTMLified by Rex Swain.
CGI.pm usage guide for the CGI library.
The Perl CD Bookshelf six book collection from unix.org.
Beginning Perl book for learning to program in Perl.
Picking Up Perl a book for new Perl programmers.
CGI101 six chapters available online.
FreeTechBooks free online Perl scripting books.
Master Index of Constructs from the Carnegie Mellon School of Computer Science.
Perl 5 by Example online book by David Medinets, "Teaches you how to use the Perl programming language by showing examples that demonstrate the concepts being discussed".
ImageMagick Object-oriented Perl Interface.
Graphics from the command line ibm article which demonstrates command line usage of ImageMagick.
Graphics Lab examples of ImageMagick usage.
Per Graphics image programming examples using GD, ImageMagick, and others.
W3C World Wide Web Security faqs.
CGI/Perl Taint mode faqs.
PerlGuts illustrated. Commented illustrations of all major internal Perl data structures.
Regular-Expressions.Info tutorials, reference listings, and examples.
Regular Expressions Tutorial includes examples and an index of expressions.
Perl Archive collection of scripts, learning center and tutorials.

Web Development

evolt.org articles and discussion on web development.
QuirksMode CSS and JavaScript tricks, w3c DOM compatibility tables.
A List Apart Magazine explores the design, development, and meaning of web content.
Boxes and Arrows bringing architecture and design to the digital landscape.
Step Inside Design explores the why of contemporary design websites by featuring interviews with creative problem-solvers, profiles of visionary creatives, analysis on business issues, and essays and commentaries on design's most relevant questions
Usit.com alertbox column, web usability, usability engineering, and Jakob's minimalist approach to Web quality.
Flash 99% Good first aid manual for usuable flash sites.
DigitalThread web designers' re-sauce. Flash tutorials to stock photography, CSS to color.
Moock web design index. Helpful links, articles, css, color tools...
Web Style Guide second editon online verson of the book.
ArtPlay tutorials, articles, templates.
Information Architecture Institute a non-profit volunteer organization dedicated to advancing and promoting information architecture.
Site Experts articles, forums and code samples.
Contentious news and musings on how we communicate in the online age
Frets-Files swish, scripting, web master tips and tutorials.
wow factor tutorials for swish, fourms, css and general web design.
Bit 101 flash and actionscript experiments.
Builder.com beyond the code. Programming, architect, manage, web development.
PageResource a web development tutorial and information site.
Caching Tutorial for web authors and web masters.
BrainJar experiments in web programming.
SitePoint publisher of web development and design content.
Particle Tree web applications / development and Treehouse, a downloadable pdf web development magizine.

ASP

ASP.net Microsoft ASP developers resources and downloads.
ASP Alliance articles, quickstart tutorials, and forums for ASP and .NET developers. Includes the ASP.NET Developer's Cookbook.
Atlas dynamic client-side user interfaces for ASP.NET.
4GuysFromRolla asp articles, coding tips, and resources. Includes user tips, message board and the latest headlines.
15 Seconds asp tutorials, asp.net tutorials, news, articles, and sample code.

XML

W3 describes the work being done at W3C within the XML Activity, and how it is structured.
w3schools XML tutorial and examples.
w3schools XSLT extensible stylesheet language tutorial.
DocBook reference to the DocBook DTD.
MSDN XML Dom reference.
MSDN developers center. Articles,downloads and code samples.
CoverPages comprehensive reference collection supporting the SGML/XML family of (meta) markup language standards and their application.
IBM developer works news and columns, technical library, downloads and open source projects.
Sun Java and XML references, downloads, tutorials and code camps.
PerfectXML to help you learn XML technologies and use them in your applications. A collection of information on all things XML.
TopXML tools and XML learning tutorials.
XMLHack news, opinions, tips and issues concerning XML development.
XML.com from the inside out at O'Reilly. Articles, news and resources. Includes a webservices section.
XML-RPC cross-platform distributed computing, based on the standards of the Internet.
WSDL reference at W3.
SOAP reference at W3.
RSS 2.0 Specifications - the Really Simple Syndication content syndication format.
XPath tutorial using the mozilla javascript interface.

Flash

SWF Guide information on the Flash File Format. Here you will find file format specifications, sample code, links to 3rd party tools and more.
Flash Central flash developers group devoted to the use and promotion of flash. Flash talk Wednesdays at 10pm EST.
GoTo and Learn flash based flash tutorials.
Flash dB dynamic flash database with PHP, ASP, CFM remoting and web services community.
SwishZone home of SWISH and SWISHmax flash development tools, tutorials and samples.
Macromedia flash and other development tools. tutorials and samples.
Flash Kit a flash developers resource site.
Kirupa tutorials, tips,actionscript, and forums.
Tutorial and Article Index from the Macromedia flash support center.
ActionScript Dictionary search the flash MX actionScript dictionary from Macromedia.
ActionScript Toolbox notes on the basics, flash objects, examples and resources.
EML Labs articles and resources for real world flash usage.

Java

The Java Tutorial Sun's guide for programmers with working examples and trails -groups of lessons on particular subject.
JavaFILE free Java scripts and Java applets to use on your site.
Dick Baldwin's Java Tutorials programming tutorials. Site also features C#, XML, Python and JavaScript tutorials.
Anfy Applets Preview demonstrations and downloads.
Jess Java Expert System Shell, a rule engine and scripting environment.

C, C++

Learn C/C++ a list of a few C and C++ language tutorials available. Include interactive tutorials, public-domain code collections, books etc.
Boost.org C++ free peer-reviewed portable C++ source libraries.
C Programming C and C++ tutorials, tools, and resources.
Programming in C UNIX system calls and subroutines using C.
C, C++ programming tutorial from About.com.

SSI

BigNoseBird SSI guide and tutorials on the usage of Server Side Includes.
Mark West SSI an introduction to and usage of SSI.
WebCom SSI another guide to using SSI.

IT

Unix tutorial for beginners. Broken into eight sections.
Unix 101 from itworld.com.
Advanced Bash-Scripting Guide An in-depth exploration of the art of shell scripting
Webmonkey Unix Guide a list of basic commands with brief descriptions.
Apache home page.
Apache Directives lists each Apache directive available in the standard Apache distribution.
Freshmeat open source, freecode, index of Unix and cross-platform software, themes and related "eye-candy", and Palm OS software.
Tech Republic real world, real time, real IT.
SQLCourse interactive online SQL tutorial.
Overview of CORBA.
USM guide to Domain Name Service.
RAD University network tutorial information.
Novell knowledge base support resources
TCP/IP introduction and Technical Overview. Frequently asked questions from ITPRC. Tutorial from Redbooks.
Cisco Documentation CD home page.
IBM Tutorials and training. Browse through the library of over 300 free tutorials.

Misc. Links

Dictionary of Programming Languages A compendium of computer coding methods assembled to provide information and aid your appreciation for computer science history.
Webopedia dictionary and search engine for computer and internet technology definitions.
What Is 'look it up' search for definitions for thousands of the most current IT-related words. Browse alphabetically or by category.
NetLingo an award-winning dictionary of Internet terms. It contains thousands of words and definitions that describe the online world of business, technology, and communication.
Faqts a growing collection of information. Browse the knowledge bases or perform specialized searches.
File-Extensions search for a specific file extension, view an alphabetical list of extensions, or browse extensions by file type categories.
Dotwhat is a database offering detailed information on file extensions. Search by type or alphabetically.
Web Hosting Talk a forum for the discussion of web hosting.
Freewebspace web host search engine.
56K.com modem central. This site is planning an update soon to include xDSL, cable, and wireless modems.
Newsletters iEntry provides free newsletters for CXO's, web developers, IT professionals and small business owners.
The List-ISP's a directory of Internet Service Providers, a resource for people looking for an Internet service provider.
Media Types IANA list of Content Types and Subtypes
Wotsit's Format file format information on hundreds of different file types and other programming information; algorithms, source code, specifications, etc.
Comprehensive guide to .htaccess tutorial and usage of .htaccess from Javascript Kit.
Spider Pro information for webmasters and developers.
Web Robots Pages information on web wanderers, crawlers, spiders that traverse the web.
Favicon.com develop favicons for your web site.
DevX applications development. Articles, code and tip banks, forums.
TechTarget search IT and developers news and articles; applications, core technologies, development, enterprise IT management, platforms.
Ruby on Rails open source web application framework written in Ruby.
Code Project free C++, C# and .NET articles, code snippets, discussions, and news.
MSNTV Developer see what coding the MSNTV set-top internet device supports.
WDVL web developer's virtual library. Authoring, design, graphics, and software information and resources for web developers.
Dr.Dobb's software tools for the professional programmer.
SiteExperts web-development discussions and resources.
Page Resources web development tutorial and information site.
PageTutor HTML, Javascript and web authoring tutorials, from absolute beginner stuff to more advanced material.
MSDN adding Windows Media to web pages.
QuickTime reference library and resources for developers.
LinuxWorld Magazine new and information for Linux developers.
Linux Laboratory a collection of articles about topics surrounding Linux and UNIX system administration.
Linux ISO fresh ISO's just like mom use to make.
The Linux Documentation Project howto's, guides, FAQs, man pages and LinuxFocus online magazine.
Tech on the Net advice, how-to's, and FAQs covering Microsoft Access, Novell, Microsoft Excel Groupwise, SQL, UNIX, Oracle/PLSQL and Linux.
DevGuru quick references for a variety of languages. Site includes articles and tutorials for web programmers.
IBM Developer Works resource for developers. Downloads, tutorials and training, forums, RSS feeds and more.
VisiBone cards and reference foldouts for JavaScript, HTML and color. Site has some free online services.
Wow Web Designs news, showcase sites, site of the day, designs, designers, tools, guides and forums.
MSDN Mocrosoft developers network. Developer Centers, library, downloads, code center, all things Microsoft.
Code Box forums for C/C++, Perl, Assembly, Java, PHP, and Visual Basic.
Planet Source Code dream it, code it! Public source code database with 8,784,625 lines of code, articles and tutorials in 11 languages.
DevDaily developer resources, general programming, Java, Perl, Linus, C/C++, OOA OOD, Ruby, and TclTk.
Tips-Tricks how-to and tutorials on web programming for beginners.
XUL Planet the XML User Interface Language, a markup language for describing user interfaces. Everything you need to know about XUL all in one place.
HotScripts search for scripts in a variety of languages.
ScriptSearch search the archives. Over 10765 resources and growing.
KingCode Search C++, DHTML, HTML, Java, JavaScript, Java JDK, Perl and Rebol script search engine.
Mpeg.org pointers and resources. Reference website for MPEG.
LAME Mp3 open source decoding and encoding project.
Beatnik rich music format audio. Information and downloads.
SS64.com guide to Oracle, Windows, Linux and OS X commands.