One of the high-quality molecular/solid state builders/visualizers. The full (commercial) version is integrated with molecular dynamic, quantum chemical and other computational chemistry/physics software.
HyperChem is a sophisticated molecular modeling environment that is known for its quality, flexibility, and ease of use. Uniting 3D visualization and animation with quantum chemical calculations, molecular mechanics, and dynamics, HyperChem puts more molecular modeling tools at your fingertips than any other Windows program.
IsisDraw is a drawing program for organic chemistry folks. It's similar to XDrawChem, ChemTool and other nifty *nix ready-made tools. Use those first if you can; if you're forced into this program, it's not bad.
A freeware viewer, processor and plotter for NMR data. A wide variety of input data formats (JEOL, Brucker, Varian etc) are accepted and a wide range of enhancement options are available (zero filling, baseline correction) and a rudimentary spin predictor.
The Sednterp program is a general purpose tool for the interpretation of sedimentation equilibrium and sedimentation velocity experiments. It collects many diverse functions into a single program. Sednterp is useful both for computing molecular structural estimates from experimental data and for interpolating physical parameters of common buffers used in sedimentation experiments.