Code Quality Rank: L3
Monthly Downloads: 64
Programming language: PHP
License: GNU General Public License v2.0 only
Tags: Communication systems     Social Networks and Forums    
Latest version: v4.3.4

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Elgg is an open source rapid development framework for socially aware web applications.


  • Well-documented core API that allows developers to kick start their new project with a simple learning curve
  • Composer is the package manager of choice that greatly simplifes installation and maintenance of Elgg core and plugins
  • Flexible system of hooks and events that allows plugins to extend and modify most aspects of application's functionality and behavior
  • Extendable system of views that allows plugins to collaborate on application's presentation layer and built out complex custom themes
  • Cacheable system of static assets that allows themes and plugins to serve images, stylesheets, fonts and scripts bypassing the engine
  • User authentication is powered by pluggable auth modules, which allow applications to implement custom authentication protocols
  • Security is ensured by built-in anti CSRF validation, strict XSS filters, HMAC signatures, latest cryptographic approaches to password hashing
  • Client-side API powered by asynchronous JavaScript modules via RequireJS and a build-in Ajax service for easy communication with the server
  • Flexible entity system that allows applications to prototype new types of content and user interactions
  • Opinionated data model with a consolidated API layer that allows the developers to easily interface with the database
  • Access control system that allows applications to build granular content access policies, as well as create private networks and intranets
  • Groups - out of the box support for user groups
  • File storage powered by flexible API that allows plugins to store user-generated files and serve/stream them without booting the engine
  • Notifications service that allows applications to subscribe users to on-site and email notifications and implement integrations with other their-party services
  • RPC web services that can be used for complex integrations with external applications and mobile clients
  • Internationalization and localization of Elgg applications is simple and can be integrated with third-party services such as Transifex
  • Elgg community that can help with any arising issues and hosts a repository of 1000+ open source plugins

Under the hood:

  • Elgg is a modular OOP framework that is driven by DI services
  • NGINX or Apache compatible
  • Symfony2 HTTP Foundation handles requests and responses
  • RequireJS handles AMD
  • Laminas Mail handles outgoing email
  • htmLawed XSS filters
  • DBAL
  • Phinx database migrations
  • CSS-Crush for CSS preprocessing
  • Imagine for image manipulation
  • Persistent caching with Memcached and/or Redis
  • Error handling with Monolog

Elgg Foundation

Elgg is managed by the Elgg Foundation, a nonprofit organization that was founded to govern, protect, and promote the Elgg open source social network engine. The Foundation aims to provide a stable, commercially and individually independent organization that operates in the best interest of Elgg as an open source project.

The Elgg project was started in 2004 by


Copyright (c) 2008-2022, see COPYRIGHT.txt

Elgg is released under the GNU General Public License (GPL) Version 2 and the Massachusetts Institute of Technology (MIT-X11) License.

See LICENSE.txt in the root of the package you downloaded.


For installation instructions, see http://learn.elgg.org/en/stable/intro/install.html.

For upgrade instructions, see http://learn.elgg.org/en/stable/admin/upgrading.html.


The project site can be found at https://elgg.org/.

Visit http://learn.elgg.org for more information about Elgg.


For development credits, see CONTRIBUTORS.txt.

*Note that all licence references and agreements mentioned in the Elgg README section above are relevant to that project's source code only.