PowerPlant
Crowd-sourced documentation and tutorials by the Cocoa developer community
A MacOS development framework that has been around since 1994. It is written in C++ and was supplied with Metrowerks' CodeWarrior environment. After CodeWarrior's discontinuation in 2005, Freescale released PowerPlant, PowerPlantX, and Constructor as OpenSourceSoftware. They are available on sourceforge at http://open-powerplant.sourceforge.net/
