Wagn (see http://www.wagn.org) is a novel approach to Wikis. It's gaining some adoption, and the reason I think it would be an ideal JumpBox is that even though it's a Rails app, it's notoriously hard to configure properly.

From their website: Wagn is

a Wiki
where people write together

+ a Database
where people organize information

+ a Content Management System
where people build cool websites