Oscail-X
 Windows Software for Crystallography and Molecular Modelling from
National University of Ireland, Galway

This software is FREE to ACADEMIC users.
Commercial users must obtain permission for its use.

Download either version of Oscail, Moilin and Tutorials (Verbose)

Oscail-X Lite version (8 Mbyte) All you need for Graphics and Modelling
(X-ray data reduction and structure solution omitted) zfoscail.exe will self install

Oscail-X Full version (15 Mbyte) Full system (self expanding zaoscail.exe) 
or if your download system does not like exe files (zaoscail.zip ) expand using pkzip

Moilin (4 Mbyte) (self expanding zmoilin.exe)
Molecular modelling will work stand alone or under Oscail

Ritmol (4 Mbyte) (self expanding zritmol.exe)
Ionic and covalent organic crystal structure prediction (Molpak users)

Oscail and Moilin Tutorials (1.5 Mbyte) (self expanding zoscailt.exe)

N.B. If you want to use Oscail install it first in the first instance.