Open Atrium is an intranet in a box that has group spaces to allow different teams to have their own conversations. It comes with six features - a blog, a wiki, a calendar, a to do list, a shoutbox, and a dashboard to manage it all.

But you're not limited to just those features. Open Atrium is completely customizable. If you want a feature that's not on that list, you can add it yourself. Read the documentation, specifically the How to Build a Feature section, to find out how to do it.

	Blog: A classic blog for each group that has commenting, file attachments on both the post and comments, and granular notifications.
	Calendar: A calendar that lets you quickly add events, suck in iCal and other calendar feeds, and support single or multi-day events.
	Group Dashboard: Mini widgets give you a snapshot of all the activity happening across your groups. Think iGoogle, in that you can turn on what you want, turn off what you don't, and arrange it all however you'd like.
	Documents: A simple online handbook that lets you collaborate on documents, store and compare revisions, attach files, and once you're done print out the final copy.
	Shoutbox: Kind of like a private twitter, the shoutbox lets you share short messages, links, and information with just the people in your group.
	Case Tracker: A full ticketing system that lets you assign to do's and create unlimited projects within each of your groups. The case tracker also lets you classify the to do, give it a priority, and manage its status.

Want more features?

The fun really starts when people start sharing the features they build for their own Open Atrium with everyone else. Then everyone doesn't just have access to six features but also a bunch of others that are easy to plugin to the basic Open Atrium package.

For more details and to start sharing, read our plans to create a decentralized network of "Feature Servers" and watch the screencast to see how a feature server will let you pull features from multiple sources and update them in both public and potentially secure ways. Also check out our notes on building a 'feature server in a box', something that would make it easy for anyone to set up their own feature server.