Free solvent software for mac

CCP4MG is a protein and nucleic acid structure viewer.
Main features:
- load multiple molecules (from PDB or mmCIF files) and display as cylinders, ball and stick, spheres, ribbons, worms and surfaces
- Extensive options to select and colour molecules
- calculate hydrogen bonds, close contacts, secondary structure and solvent accessible area
- displays molecule surfaces and electrostatic potential
- displays results of QM field calculations
- generate symmetry mates
- superpose structures
- load maps from MTZ, display as continuous crystal and fast changing contour level
- flexible labelling and annotation, display of images and arbitrary labelled vectors
- save image as png,jpeg etc. also PostScript or POV-Ray input file
- easy to make animated GIF or mpeg movies
- create/edit/replay scripts.