ocPortal

ocPortal is an open source website engine/manager with built-in advertising features, e-commerce, community, the usual suspects. Looks rather interesting.

From the website:

ocPortal - the web content management system (software for building and maintaining a dynamic website) that keeps you behind the wheel.

ocPortal's powerful feature-set means there's always a way to accomplish your vision.

Not only does it have all the features you'd expect: for instance galleries, news, file downloads and community forums/chats, but it does so whilst meeting the highest accessibility and professional standards. It is also smart enough to go beyond page management, to automatically handle search engine optimisation, and provide aggressive hack attack prevention.

Ugly URLs though. They should work in some backend redirects to clean those up.

Visit ocPortal