CCP4

``The [Collaborative Computing Project number 4] program suite is a collection of disparate programs covering most of the computations required for macromolecular crystallography.''[]

Documentation for ccp4 can be obtained through the Unix man command.
An html version can be found locally on the DND MacroCryst page (minus the example scripts). If you are mounted on /usr/xtal, you can view the documentation with the example scripts ¹.