ChiliProject is not maintained anymore. Please be advised that there will be no more updates.
We do not recommend that you setup new ChiliProject instances and we urge all existing users to migrate their data to a maintained system, e.g. Redmine. We will provide a migration script later. In the meantime, you can use the instructions by Christian Daehn.
ChiliProject plugins are a type of Ruby on Rails plugins called Rails Engines. Between Ruby, Rails, and Engines plugins can do just about anything to ChiliProject, including modify the core code automatically.