The SensioLabs security advisories checker is a simple tool, available as a web service or as an online application, that uses the information from your composer.lock file to check for known security vulnerabilities.

Zephir, an open source, high-level/domain specific language designed to ease the creation and maintainability of extensions for PHP with a focus on type and memory safety.

The PHP Coding Standards Fixer tool fixes most issues in your code when you want to follow the PHP coding standards as defined in the PSR-1 and PSR-2 documents.

Codeception PHP Testing Framework is designed to work just out of the box. This means its installation requires minimal steps and no external dependencies preinstalled (except PHP, of course). Only one configuration step should be taken and you are ready to test your web application from an eye of actual user.

The tweet-sized continuous integration app for PHP development.

Kint for PHP is a tool designed to present your debugging data in the absolutely best way possible.

In other words, it’s var_dump() and debug_backtrace() on steroids. Easy to use, but powerful and customizable. An essential addition to your development toolbox.

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is damn vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, help web developers better understand the processes of securing web applications and aid teachers/students to teach/learn web application security in a class room environment.

Phalcon is a web framework implemented as a C extension offering high performance and lower resource consumption.

Bolt is a tool for Content Management, which strives to be as simple and straightforward as possible. It is quick to set up, easy to configure, uses elegant templates, and above all: It’s a joy to use. Bolt is created using modern open source libraries, and is best suited to build sites in HTML5 with modern markup.

From a technical perspective: Bolt is written in PHP, and uses either SQLite, MySQL or PostgreSQL as a database. It's built upon the Silex framework together with a number of Symfony components and other libraries. Bolt is released under the open source MIT-license.

A minimalist database toolkit for PHP5.

Object relational mapper (ORM), fluent SQL query builder and Active Record implementation for PHP.

Pimple is a small Dependency Injection Container for PHP 5.3 that consists of just one file and one class (about 50 lines of code).

Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal is to offer a test double framework with a succint API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL). Designed as a drop in alternative to PHPUnit's phpunit-mock-objects library, Mockery is easy to integrate with PHPUnit and can operate alongside phpunit-mock-objects without the World ending.

A minimalist, opensource online pastebin where the server has zero knowledge of pasted data. Data is encrypted/decrypted in the browser using 256 bits AES.

dbv.php is a database version control web application featuring schema management, revision scripts, and more!

Mink is an open source acceptance test framework for web applications, written in PHP 5.3.

Dependency Manager for PHP

ApiGen is the tool for creating professional API documentation from PHP source code, similar to discontinued phpDocumentor/phpDoc.

Sami: an API documentation generator

This PHP library allows creating functional webdriver tests with PHP.

Goutte is a screen scraping and web crawling library for PHP.

Goutte provides a nice API to crawl websites and extract data from the HTML/XML responses.