Downloading stCAD 4.2.9.23590 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The stCAD installer is commonly called CICTKT.exe, RunSTCAD.exe or stCAD.exe etc.
StCAD is included in Photo & Graphics Tools. The actual developer of the free software is AR-CAD. This free PC program operates ".sdf" file. You can execute stCAD on Windows XP/7/8/10/11 32-bit. We recommend checking the downloaded files with any free antivirus. The most popular versions among stCAD users are 8.0, 4.2 and 4.1.
From the developer:
StCAD is a basic 3D CAD framework in Smalltalk (VisualWorks 7.x). It extends the GF/ST 2D drawing framework into 3D. It also include 'StGeo' which is the 3D geometric domain, ‘StMath' which provides the mathematical support for 3D CAD and motion simulation computations, and 'StDoc' which is a simple word processor.
'StMath' is also suitable for engineering, scientific and business computing.
You may want to check out more software, such as VFDS, Panorama Tools or Smart Map, which might be related to stCAD.