MacZoop is a C++ framework for writing general Mac applications. This is a comprehensive framework that takes the drudge out of writing apps for Mac OS 7.0 through to 9.x. Aimed at beginners and smaller projects, it gets you up to speed very quickly. It's very solid, stable, comprehensive, well-supported and above all, free! Comes as source code- requires CodeWarrior.
Version 2.6.1 fixes misc. bugs.
System 7.0 or later, CodeWarrior (any version).