Downloading ZEDDemo 3.0.5 from our website was free. The common filenames for the program's installer are ZEDDemo_Basic.exe or ZEDDemo_Global.exe etc. This free software was originally developed by ZED Tunnel Guidance. ZEDDemo lies within Education Tools, more precisely Science Tools. The following version: 3.0 was the most frequently downloaded one by the program users.
From the developer:
The Global Coordinate System or ZED, represents the next level of complexity compared to the Minimised Basic and Basic systems for guiding Tunnel Boring Machine (TBM). Wholly designed and manufactured by ZED, for use on more complex tunnel alignments that may include small radius curves in one or two dimensions, vertically & horizontally.
You may want to check out more software, such as CAEFEM, Photometric Toolbox32 or GenealogicaGrafica, which might be similar to ZEDDemo.