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Is there a module in GRASS or SAGA (or a alternative open program) to do a topographic correction of a landsat image to enhance the land use classification?

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For SAGA:

Module Name
Topographic Correction
Menu Terrain Analysis > Lighting

Note that you can always search for a module by right clicking "module library"in the workspace tab.

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Not really a direct answer, but I can't make comments. I haven't used any of the tools on the page but have you had a look at the GRASS image processing page? It lists GRASS tools for classification and image correction.

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In GRASS, use i.topo.corr. See http://grass.osgeo.org/wiki/Image_processing#Correction_for_topographic.2Fterrain_effects

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