A calendar to manage events and meetings in your project with ical integration (e.g. Google calendar). Enable
the Atrium Calendar feature and add it in the appropriate group space
or feature preset in private mode.

A public blog that allows you to communicate the progress on a project with the outside community. Especially useful for projects that want to keep all of their stakeholders (both known and unknown) informed (e.g. public sector, grassroots, open source, etc.).

A set of Wiki pages that can be used by a team. Enable the Atrium Documents feature and add it in the appropriate group space or feature preset in private mode. Consider using a translation hack to exchange "Documents" for "Wiki" in the UI.