Elgg – Open Source Social Networking

Elgg enables individuals, groups and institutions to create their own fully-featured social environment.

Elgg, started in 2004, is an open source social platform which powers all kinds of social environments – from education to business and sports such as rugby. If you are looking to create your own social application or want to build and run a site for your organisation, Elgg is a great choice as it provides the building blocks you will need.