Try gdis. It can directly read and write fdf files and can create a surface slab with given Miller indices. I don't know if you can create a crystal from scratch.
http://sourceforge.net/projects/gdis/

More powerful, but text-based and clunky to use, is tetr. http://www.cmmp.ucl.ac.uk/~lev/codes/lev00/index.html

  Herbert

Christopher Rowan wrote:
I personally use GaussView. Maestro is free, and good for molecules. But if you're only interested in crystal surfaces you could write your own code, say in fortran, to generate a periodic structure.

Chris Rowan

2010/1/7 min gao <[email protected] <mailto:[email protected]>>

    Dear all,

    I am learning the siesta now, while I still can not find a suitable
    software to construct the surface. Most of the softwares are
    charged,so is there some kind is free or cheap? what kind of
    software are you using for the siesta? Thank you very much

    Yours,
    Min Gao



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Herbert Fruchtl
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School of Chemistry, School of Mathematics and Statistics
University of St Andrews
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