Chaos tool suite (ctools) This suite is primarily a set of APIs and tools to improve the developer experience.
It also contains a module called the Page Manager whose job is to manage pages. In particular it manages panel pages, but as it grows it will be able to manage far more than just Panels. For the moment, it includes the following tools: Plugins -- tools to make it easy for modules to let other modules implement plugins from .inc files. Exportables -- tools to make it easier for modules to have objects that live in database or live in code, such as 'default views'.