If you've not already heard it elsewhere, the Indie+Relief page contains all kinds of great, independent Mac software for sale, with all proceeds being donated to the crisis in Haiti.
So much was going on with FuzzMeasure 3.2 that I had to stop myself in my tracks, cut features, and simply focus on getting the few key changes that I've made so far into my customers' hands.
SMUGOpenCL is an open-source library (MIT License) that provides a Cocoa wrapper to the OpenCL framework in Mac OS X 10.6 Snow Leopard. Its applications include game programming, scientific computing, image processing, and much more.
SMUGMath is an open-source library (MIT License) that is designed for working with large vector data sets. Applications lie in signal processing and statistics, among many others.