VisualWorks Smalltalk has drifted and evolved across the years eventually winding up with CINCOM. While not Open Source, it is a mature product and CINCOM has a liberal download policy for non-commercial use. They encourage you to register before downloading, but do not absolutely require you to do so, which shows the right spirit.

Updated: Sept 10 2007

Smalltalk.org is the main link - it's a good kick-off point for Smalltalk adventures. The whysmalltalk.com site is also a good resource, even if some of the event announcements are several years old.

A great list of free Smalltalk books on the web.

Updated Sept 7 2008: added seaBreeze link

Seaside

To get a good feel for Seaside development environment, read the excellent technical introduction by Shaffer Consulting.

Note that the article was written in 2005 and may be obsolete in parts. For example, Seaside now supports several object-oriented databases, including Gemstone.

From the site: "xajax is an open source PHP class library that allows you to easily create powerful, web-based, Ajax applications using HTML, CSS, JavaScript, and PHP".

There is also a fairly inactive Xajax module project at Drupal, although it may be lurking to life again, because some one did the Xajax upgrade for Drupal 5.1 recently.

From the jQuery site: "jQuery is a fast, concise, JavaScript Library that simplifies how you traverse HTML documents, handle events, perform animations, and add Ajax interactions to your web pages".

jQuery is also the base Javascript library in Drupal.

Also see the Weblink to PQuery.

From the PQuery site:

PQuery is a set of helper classes for JQuery JavaScript library.This library allows you to easily integrate AJAX , Effects and other JQuery functionality into your PHP scripts.IT has a small foot print and is compatible with PHP4 and PHP5.

PEAR PHP_Debug, Project description:

PHP_Debug : A simple and fast way to debug PHP code This PHP debug library offers you the ability to debug your PHP code and generate a trace of your program. - Process time - Database and query process time - Functional debug - Check performance

A simple fast tool that seems to provide most of what a PHP programmer needs ( minus having to recompile the PHP sources ). Requires Javascript.

Gubed is a cross platform program to debug PHP scripts.

Three-part "Learning PHP" series, teaching you how to use PHP through building a simple workflow application

Also see Using PHPEclipse : Installation : Installing the DBG Debugger.

Excellent tutorials and references.

Surveying open-source AJAX toolkits

Mozilla's Category:AJAX

Cook up Web sites fast with CakePHP

Adding related information and services

Bake bigger and better with CakePHP

Use Sanitize for your protection

Use CakePHP's Session and Request Handler components

Link to BB.COM SOA Subject