PHP

Phalanger is a project which was started at Charles University in Prague and was supported by Microsoft.

Composer is an application-level package manager for the PHP programming language that provides a standard format for managing dependencies of PHP software and required libraries.

Qcodo is an open-source PHP web application framework which builds an object-relational model (ORM), CRUD (create, retrieve, update, delete) UI pages, and AJAX hooks from an existing data model.

Perl Compatible Regular Expressions (PCRE) is a regular expression C library inspired by the regular expression capabilities in the Perl programming language.

Xdebug is a PHP extension which provides debugging and profiling capabilities.

Active Agenda is an open source risk management tool.

Zend Studio is a commercial, proprietary integrated development environment (IDE) for PHP developed by Zend Technologies, based on the PHP Development Tools (PDT) plugin for the Eclipse platform (the PDT project is led by Zend).

SquirrelMail is a project that provides both a web-based email client and a proxy server for the IMAP protocol.

Roundcube is a web-based IMAP email client.

The Zend Engine is the open source scripting engine that interprets the PHP programming language.

LAMP is an archetypal model of web service solution stacks, named as an acronym of the names of its original four open-source components: the Linux operating system, the Apache HTTP Server, the MySQL relational database management system (RDBMS), and the PHP programming language.

A PHP accelerator is a PHP extension designed to improve the performance of software applications written in the PHP programming language.

HipHop for PHP (HPHPc) is a discontinued PHP transpiler created by Facebook.

Smarty is a web template system written in PHP.

KPHP (kPHP or KittenPHP) is a free PHP-to-C++ source-to-source translator, developed by VKontakte.

phpDocumentor is an open source documentation generator written in PHP.

Codelobster is a portable integrated development environment (IDE) primarily for PHP, which also supports HTML, CSS, and JavaScript development.

NuSphere is a software company based in Reno, Nevada in the United States, specializing in programming tools for web applications.

PHP Development Tools (PDT) is a language IDE plugin for the Eclipse platform and the open source project that develops it.

TinyButStrong is a web template system written in the PHP language.

Twig is a template engine for the PHP programming language.

SQL Buddy is an open source web based application written in PHP intended to handle the administration of MySQL and SQLite with the use of a Web browser.

JetBrains PhpStorm is a commercial, cross-platform IDE for PHP built on JetBrains' IntelliJ IDEA platform.

The acronyms BAPP (or B.A.P.P.) and BAMP (or B.A.M.P.) refer to a set of open-source software programs commonly used together to run dynamic web sites or servers.

Novius OS is a content management system (CMS) open source (GNU Affero General Public License v3) designed for multi-channel Internet (Create Once Publish Everywhere) and published by the company Novius since 2011.

Behat is a test framework for behavior-driven development written in the PHP programming language.

PHP Unit Testing Framework is a unit testing framework that enables developers to discover bugs and in turn drive down the costs associated with developing PHP software.

PHPMailer is a code library to send (transport) emails safely and easily via PHP code from a web server (MUA to the MSA server).

lime is a unit testing and functional testing framework built specifically for the Symfony web application framework based on the Test::More Perl library.

ScriptCase RAD is a development platform for PHP applications, is web oriented and can be installed in a server in the internet.

Zend Server includes over 80 PHP extensions and supports Apache, NGINX and IIS Web servers.

The Rocks Library contains a database independent object-relational mapper (ORM) for PHP 5.

Praspel (PHP Realistic Annotation and Specification Language) is a formal specification language for PHP.

CTPP (or CT++) is a template engine completely written in C++.