Rectify photos with the help of photogrammetry. So you get a completely level view of one side of a building for example. So you can take the result for measurements of this building. You can export the result as picture or as DXF file.
Physion is a 2D Physics simulation software. You can use it to easily create various physical objects (polygons, gears, ropes, springs, pulleys etc) and experiment with their properties. It can be used for both educational and ... fun purposes!