Project Website: http://www.joomlapolis.com/
Download Location: (Click)
Languages available: English, German

CommunityBuilder lets you define your own registration and user details pages. You can simply add all sorts of fields and define whether they are required to be filled out or/and if they are shown on the public profile page.
CommunityBuilder also brings a highly customizeable userlist which can easily be browsed.
I think, this one is a must have for all lanparty sites, because most of the time you need the user's full address and contact details.