JB72  Overall a very useful package for anyone wanting to produce scientific plots. It has a few quirky limitations, but also some strengths that are not easily duplicated in other graphing packages. Note also that version 2 has added a lot of extra statistical analyses compared to v1, and could be used as a light/occasional stats package in addition to its graph-drawing abilities. (NB I've always had replies to my bug reports/tech support requests, and they have implemented feature requests that I made for things not included in v1, e.g. multiple column selection for adjusting line styles.)  
(Version 2.1)

JB72  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.  
(Version 1.2)