Downloading RTOPO 3.8 from our website was free. The actual developer of the software is Rcad Software. The following versions: 3.8, 3.3 and 3.1 were the most frequently downloaded ones by the program users. The software lies within Photo & Graphics Tools, more precisely 3D Design.
From the developer:
Simple, powerful and inexpensive CAD software for surveying. You can do triangulation, isolines, color-filled contour maps, sections, intersections, volume and much more. You can process hundreds of thousands of points or triangles, even on less powerful PCs.
You may want to check out more software, such as RTOPO Hydrology, which might be related to RTOPO.