HTML / CSS / JavaScript

HTML at htmlhelp.com

HTML at w3.org

CSS at htmlhelp.com

CSS at msdn.microsoft.com

CSS2 at w3schools.com

JavaScript/DOM w3schools.com

JavaScript/DOM on Firefox mozilla.org

AJAX and Frameworks

Prototype.js sergiopereira.com

Prototype.js prototypejs.org - Dusan Maliarik ^NEW

Google GWT

jQuery from Rich Manalang

Yahoo! UI from Misha Peric

MochiKit from Arnar Birgisson

XML

XSL w3schools.com

XPath w3schools.com

Schema (XSD) w3schools.com

XML DOM w3.org

DITA at oasis-open.org

DocBook at docbook.org

C/C++, Libraries

C, C++, STL at cppreference.com

RogueWave

Dinkumware C/C++/STL - Jason Petrone

Berkeley DB XML in C++ - Michael Driscoll

OpenGL 2.1 - James Darpinian

PHP

PHP at php.net

PHP Tutorials - misc sources

CakePHP at cakephp.org

Symfony at symfony-project.com

Ruby / Rails

Ruby/Rails at ruby-doc.org & rubyonrails.com

Ruby Standard Packages at ruby-doc.org

RMagic simplesystems.org - Adam Christensen

Python

Python at docs.python.org `

More Programming Languages

Perl Functions at aspn.activestate.com

Sicstus Prolog from Rowan Nairn

Erlang - Matthew Pflueger

Adobe/Macromedia

ActionScript

ActionScript (frames)

ColdFusion Tags & Functions

Flex 2

Groovy

Groovy 1.0 from Marc Dexet ^updated

Drupal CMS

Drupal 4.7/HEAD

Flickr

Flickr API from parhuzamos

Databases

MySQL at mysql.com

PostgreSQL at postgresql.org

Oracle9i

Oracle10g

Java

J2SE v1.3.0

J2SE v1.4.2

J2SE v1.5.0

J2SE v1.5.0 less UI

J2EE

Struts

Spring Framework

Hibernate

Castor

Log4J

Apache RegExp

Apache Commons Net

Ant at ant.apache.com

Application Testing

JUnit

HttpUnit

DbUnit

Selenium - Tom Smyth

Orb

Orb API - Orb Networks