The core tools are always on. Choose the other apps your community wants; you can turn them on or off later in System settings.
CalendarEvents, RSVPs, group calendars and subscriptions
ChatChannels, threads, direct messages and chat tools
HomeYour dashboard: events, to-dos, messages and what's new
MembersRoster, roles, groups and the join wizard
ProfileContact info, groups, notifications, preferences and dues
To-DoEveryone's action items in one list