iNMR is an excellent package for NMR processing that runs natively under OS X. The processing is rapid and straightforward, and has a simple menu system with a number of useful keyboard shortcuts. It's a particularly good solution for someone who works with a lot of NMR spectra but is not necessarily a full-time spectroscopist and does not want to have to deal with something like nmrpipe. The best feature is the development support - based on my own experience, request a feature and it may just get programmed in within a week or two. The high rating for value is given in comparison to similar Windows-based menu-driven software such as ACDLabs.