PHP Frameworks
Laravel, MVC, Symfony, Zend Framework, CakePHP, CodeIgniter, Yii, FuelPHP, Ionic, Phalcon, Sencha, Smarty Templates
Databases
MySQL, MariaDB, GraphQL, PostgreSQL, Microsoft SQL, Firebird, HeidiSQL, MongoDB, phpMyAdmin
Javascript
ReactJS, Node.js, Angular JS (all versions), Bootstrap, jQuery, Meteor.js, JSON, AJAX, Backbone.js, ExpressJS, ExtJS
E-commerce
Shopping carts (Magento, OpenCart, osCommerce, Prestashop, Americart, WooCommerce, X-Cart, Zen Cart), Payment gateways (Paypal, Authorize.net, Stripe, etc)
Content management systems
Wordpress, Joomla, Drupal, CMS Made Simple, Concrete5
Google
Google Maps, Google APIs, Google Plus API, Gmail APIs, Google AdSense, Google Adwords, Google Analytics, Google Wallet
Social Media
Facebook, Twitter, Linked In
Cloud Technologies
Amazon Web Services, Google Cloud Messaging
Versioning Systems
CVS, Github, Subversion, Tortoise SVN
Web basics
HTML, CSS, FTP
Other
Development libraries (Curl, GD, ImageMagick, PDF Libraries, Pear, SOAP), Testing (PHPUnit), third-party APIs (e.g. Xero API, Youtube APIs, Rest API, WhatsAPI), and much more