community.elgg.org - This theme is an example theme framework that can be used as a starting point for your own theme work. It requires Elgg version 1.5. It includes overrides for all the graphics (default avatars, group icons, river icons, file type icons,...

community.elgg.org - Customize your main page and login page by dragging-and-dropping widgets on it

code.elgg.org - Kses is an HTML/XHTML filter written in PHP. It removes all unwantedHTML elements and attributes, no matter how malformed HTML input you give it.It also does several checks on attribute values. kses can be used to avoidCross-Site Scripting (XSS),...

community.elgg.org - Elgg code is being hosted in a Subversion repository located at https://code.elgg.org/elgg/. In addition the issue tracker at http://trac.elgg.org/elgg/browser provides a comfortable interface for browsing the source and to follow commits.