Yes, Whitebox GAT (Geospatial Analysis Toolbox) is #4 on the list of open source, free GIS software. Unbelievably, Whitebox GAT has only been around since 2009 because it feels so fine-tuned when you see it in action.
Does anyone whether any of these free programs can do things like converting a landxml file to a tin? What about tin to raster? These are the two most common tools available under the 3D Analyst set of tools in Arc that I use. Our company has 2 licenses and they are always in use. I would love it if one of these programs has these tools so that I can do these conversions whenever I need to, it would help me immensely. Does anyone know anything about this? 2b1af7f3a8