GCDrawKit is a Cocoa Vectror Graphic Framework from AppTree attempts to do for drawing applications what Cocoa’s text system does for text applications. It provides a set of interrelated classes which implement a complete vector-drawing framework, while trying to maximise flexibility and remaining agnostic about the final end use of the application.

For Mac OS X developers who want to reuse existing code and build flexible applications. Blocks is an Eclipse inspired plugin framework that makes it possible to resuse existing code and extend your application with plugins.