MGTwitterEngine
mjtsai.com/blog/2008/02/22/mgtwitterengine
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Matt Gemmell:
MGTwitterEngine is a Objective-C class which lets you integrate Twitter support into your Cocoa application, by making use of the Twitter API. The entire API is covered, and appropriate data is returned as simple native Cocoa objects (NSArrays, NSDictionarys, NSStrings, NSDates and so on), for very easy integration into your own application. MGTwitterEngine is designed for Leopard, but should be just fine on Tiger too.