linux linear programming model

[betty]

anyone know a linear programming  model (for feed ingredients) that is 
avail as an open source program???

i do my own dog diet blending and it is pretty tiring to use gnumeric 
(or else i don't know all the features; obviously another consideration)

i looked on line but most (all) of the pet food programs are keeping it 
close to the vest since it is their bread and butter (sorry about the 
mixed metaphors :(  )

-- 
betty i.
www.webcanine.com
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who care for dogs.