OSX OBJC Sources?

hello folks, checked forum , not find similar thread go ahead , start 1

guys know cool links source code written in objc osx platform?

have 1 page has sweet small apps osx.
http://mattgemmell.com/source/

looking bit bigger programs though can go trough , understand inner workings

 

did @ sample codes in apple developer library? quite extensive, , include full programs sometimes, e.g. little drawing program

https://developer.apple.com/library...html#topic=sample+code&section=resource+types

 

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