does anyone know a substitution for CrystalMaker

["Ji ZhengYu" <zhengyuji@gmail.com>]

Hi,
As subject. I am looking for a software to substitute for CrystalMaker,
any suggestion?

I need this software to demo some structures  when I teach students
about crystal structure. Without demo, students usually have difficult
to imagine the structure, such A4, A3, A6 stacking, or something like
body centered cubic and so on.

-- 
Regards,

G