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It's good easy to learn to use for MEP Drawings Brics CAD can use Cad & BIM extension file DWG # Philemon _Dubai
Google Earth Pro - Google Earth Pro allows you fly anywhere around the earth to view satellite imagery, maps, 3D building, and terrain, from galaxies in outer space to the canyons of the ocean.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
QGIS - QGIS is a desktop geographic information system, or GIS.
SketchUp - 3D for Everyone
CloudCalc - CloudCalc provides free cloud based structural analysis software.
FreeCAD - An open-source parametric 3D modeler