BlockCADBlockCAD 
BlockCAD (Blockcad.exe). BlockCAD is not a full CAD program, the pieces can only be placed 'studs up', and rotated in steps of 90 degrees.
BlockCAD is a free and user-friendly 3D modeling program that lets you create virtual Lego-like models. With an intuitive interface, you can easily save your creations or export images (.bmp, .jpg) of your designs. You can also reuse complete models as components in new projects, giving you endless possibilities for creativity and fun.
While BlockCAD isn’t a fully-fledged CAD software, it offers a straightforward platform for building models with Lego-style bricks. Pieces can only be placed "studs up" and rotated in 90-degree increments, making it accessible for all skill levels. However, some advanced designs, like those from the Lego Technic line, might not be possible due to restrictions like overlapping pieces. Despite this, BlockCAD remains a fantastic choice for anyone looking to create simple virtual Lego models or explore basic 3D modeling concepts.
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