NMRView - Software for the visualization and analysis of NMR data
Pronto - is a tool for assignment of multidimensional spectra of macromolecules
ScienceSoft's NMR Software Site - Automated optimization and analysis of multi-dimensional Nuclear Magnetic Resonance spectra using NMRanalyst, AssembleIt, LockIt, and ShimIt.
Sparky - A free C++ program for NMR display, assignment, peak integration, and analysis, which runs on multiple platforms.
XEASY - A C program, that runs on X-Windows, performs spectral analysis and automated spectroscopy.