CalQuan 2012.0 that could have been downloaded from our website for free. The program is included in Photo & Graphics Tools. This software is a product of CalQuan India.
From the developer:
CalQuan is a software application for generating contours, grid cutting, survey drawings, LSections, Volume calculations of open plots and reservoirs. The software is designed for Infrastructure Development, Construction and Project Management Companies, it is easy to install and easy to use
You may want to check out more software, such as Vue Infinite, AllyCAD or fragMOTION, which might be related to CalQuan.