[GIS] Topographic correction (for land use classification) with SAGA or GRASS

Question

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?

Answer 1

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.