Doctrine is a collection of projects built for PHP. Each project can be used standalone and installed with Composer.
PHP Doctrine Cache library is a popular cache implementation that supports many different drivers such as redis, memcache, apc, mongodb and others.
The Doctrine Coding Standard is a set of PHPCS rules applied to all Doctrine projects.
PHP Doctrine Collections library that adds additional functionality on top of PHP arrays.
PHP Doctrine Common project is a library that provides additional functionality that other Doctrine projects depend on such as better reflection support, proxies and much more.
Database Abstraction Layer
Powerful PHP database abstraction layer (DBAL) with many features for database schema introspection and management.
The Doctrine Event Manager is a simple PHP event system that was built to be used with the various Doctrine projects.
PHP Doctrine Inflector is a small library that can perform string manipulations with regard to upper/lowercase and singular/plural forms of words.
A small, lightweight utility to instantiate objects in PHP without invoking their constructors
PHP Doctrine Migrations project offer additional functionality on top of the database abstraction layer (DBAL) for versioning your database schema and easily deploying changes to it. It is a very easy to use and a powerful tool.
MongoDB Object Document Mapper
PHP Doctrine MongoDB Object Document Mapper (ODM) provides transparent persistence for PHP objects to MongoDB.
The Doctrine Persistence project is a set of shared interfaces and functionality that the different Doctrine object mappers share.
PHP Doctrine Content Repository Object Document Mapper (ODM) provides transparent persistence for PHP objects.
The Doctrine Reflection project is a simple library used by the various Doctrine projects which adds some additional functionality on top of the reflection functionality that comes with PHP. It allows you to get the reflection information about classes, methods and properties statically.
The Doctrine SkeletonMapper is a skeleton object mapper where you are 100% responsible for implementing the guts of the persistence operations. This means you write plain old PHP code for the data repositories, object repositories, object hydrators and object persisters.
These are projects that integrate Doctrine with other libraries and/or frameworks and are officially supported by Doctrine.
Doctrine Cache Bundle
Doctrine Laminas Hydrators
Doctrine Migrations Bundle
Doctrine Module for Laminas
Doctrine MongoDB Bundle
Doctrine MongoDB ODM Module for Laminas
Doctrine ORM Module for Laminas
These were once active and maintained projects. If you are interested in helping to maintain any Doctrine project take a look at the open issues on GitHub and submit pull requests.
CouchDB Object Document Mapper
OrientDB Object Document Mapper
These project are no longer maintained with no chance of revival and have been archived.