LeoCAD is a CAD program for creating virtual LEGO models. It has an easy to use interface and currently includes over 6000 different pieces created by the LDraw community.
Open Cascade CAD Assistant is a powerful offline 3D CAD viewer and converter with simple and intuitive interface, free for both personal and commercial use. Originally developed as a testbed and showcase for the Open CASCADE Technology on mobile platforms, the solution has been...
Now even better: FluidDraw stands for fast and easy standardised documentation of your machines or systems. With the new FluidDraw P6, you can create pneumatic and electric circuit diagrams even more reliably and efficiently.