PHP: http://php.net/

IBM developerWorks: http://www.ibm.com/developerworks/opensource/

Symfony official forum: http://forum.symfony-project.org/

Symfony code snippets: http://snippets.symfony-project.org/

Yet another Symfony community site: http://symfonians.net/

Unofficial forum: http://www.cakephpforum.net/

Cake's tutorial bakery: http://bakery.cakephp.org/

CakePHP questions and answers: http://ask.cakephp.org/

Nice CakePHP video tutorials by Andrew Perk: http://www.youtube.com/user/andrewperk

Zend Framework's API: http://framework.zend.com/apidoc/1.11/

Zend video tutorials: http://www.zendcasts.com/

Zend Framework tutorials: http://www.zftutorials.com/

Zend developers zone — more tutorials: http://devzone.zend.com/public/view

Design patterns at SourceMaking: http://sourcemaking.com/design_patterns

IBM developerWorks design patterns in PHP: http://www.ibm.com/developerworks/library/os-php-designptrns/

Martin Fowler's articles on design patterns and software architecture: http://martinfowler.com/articles.html

Doctrine: http://www.doctrine-project.org/

Propel: http://www.propelorm.org/

Graphvis, the library used by Propel to draw database schema diagrams: http://www.graphviz.org/

DBDesigner — nice tool to export your database to a picture: http://www.fabforce.net/dbdesigner4/

MySQL: http://www.mysql.com/

PostgreSQL: http://www.postgresql.org/

Oracle database: http://www.oracle.com/us/products/database/index.html

IBM DB2: http://www-01.ibm.com/software/data/db2/

Microsoft SQL Server: http://www.microsoft.com/sqlserver/en/us/default.aspx

SQLite: http://www.sqlite.org/

MongoDB — NoSQL database: http://www.mongodb.org/

OpenLDAP: http://www.openldap.org/

Active Directory: http://www.microsoft.com/windowsserver2008/en/us/ad-main.aspx

Active Directory Lightweight Directory Services: http://www.microsoft.com/downloads/en/details.aspx?familyid=A45059AF-47A8-4C96-AFE3-93DAB7B5B658&displaylang=en

IBM Tivoli Directory Server: http://www-01.ibm.com/software/tivoli/products/directory-server/

389 Directory Server — Red Hat's LDAP: http://directory.fedoraproject.org/

Equivalent for phpMyAdmin for LDAP: http://phpldapadmin.sourceforge.net/

Apache Directory Studio: http://directory.apache.org/studio/

Sphinx search engine website: http://sphinxsearch.com/

Apache Lucene: http://lucene.apache.org/

Zend_Search_Lucene official documentation: http://framework.zend.com/manual/en/zend.search.lucene.html

Google Search API — REST-based: http://code.google.com/apis/customsearch/

Google Search AJAX API — deprecated: http://code.google.com/apis/loader/signup.html

PHPUnit: http://www.phpunit.de/

SimpleTest: http://www.simpletest.org/

Selenium: http://seleniumhq.org/

Selenium integrated with Eclipse: http://cubictest.seleniumhq.org/

Jmeter — performance-testing tool: http://jakarta.apache.org/jmeter/

Wireshark — sniffing tool: http://www.wireshark.org/

OWASP: http://www.owasp.org/index.php/Main_Page

ReCaptcha: http://www.google.com/recaptcha

OpenCaptcha: http://www.opencaptcha.com/

Zend Captcha library: http://framework.zend.com/manual/en/zend.captcha.html

TCPDF library for PDF generation: http://www.tecnick.com/public/code/cp_dpage.php?aiocp_dp=tcpdf

FPDF — another PDF generation library: http://www.fpdf.org/

SOAP UI — nice SOAP testing tool: http://www.soapui.org/

cURL library — command-line services tool : http://curl.haxx.se/

Swift mailer: http://swiftmailer.org/

PHPMailer: http://phpmailer.worxware.com/

Smarty: http://www.smarty.net/

Dwoo: http://dwoo.org/

Twig: http://www.twig-project.org/

OPT template engine: http://www.invenzzia.org/en/projects/open-power-libraries/open-power-template

Tiny But Strong template engine: http://www.tinybutstrong.com/

Rain TPL: http://www.raintpl.com/

Savant3: http://phpsavant.com/

Netbeans for PHP: http://netbeans.org/features/scripting/index.html

Eclipse PHP IDE: http://www.eclipse.org/pdt/

JQuery: http://jquery.com/

Dojo: http://www.dojotoolkit.org/

YUI: http://developer.yahoo.com/yui/

Mootools: http://mootools.net/

Ext: http://www.sencha.com/products/js/

Google Web Toolkit: http://code.google.com/webtoolkit/

Ten autocomplete AJAX scripts: http://webtecker.com/2008/03/10/10-auto-complete-ajax-scripts/

Nice library of ready-to-use AJAX solutions: http://www.ajaxrain.com/

Apostrophe: http://www.apostrophenow.com/

Diem: http://diem-project.org/

Sympal: http://www.sympalphp.org/

Croogo: http://www.croogo.org/

Wildflower: http://wf.klevo.sk/

TomatoCMS: http://www.tomatocms.com/

Pimcore: http://www.pimcore.org/

Digitalus CMS: http://digitaluscms.com/

Official CodeIgniter's video tutorials: http://codeigniter.com/tutorials/

List of more than 40 CodeIgniter tutorials: http://www.2expertsdesign.com/tutorials/codeigniter-framework-tutorials-for-php-application

Official Lithium blog tutorial using MongoDB: http://rad-dev.org/lithium/wiki/drafts/blog-tutorial

Longer Lithium tutorial using MySQL: http://www.sanisoft.com/blog/2010/04/12/the-lithium-blog-tutorial-part-1/

Agavi official documentation: http://www.agavi.org/documentation/tutorial

Agavi unofficial FAQ: http://www.mivesto.de/agavi/agavi-faq.html

A tutorial showing how to build a sophisticated web application with Agavi: http://www.ibm.com/developerworks/views/xml/libraryview.jsp?search_by=Introduction+to+MVC+Programming+with+Agavi