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Creo Elements/Direct Modeling Express 4.0

From: http://www.ptc.com/products/creo-elements-direct/modeling-express/

5-free-tools-to-draw-a-network-diagram

From: https://blog.neweggbusiness.com/over-easy/5-free-tools-to-draw-a-network-diagram/

CADE is a primarily a CAD tool
yED is a Java-based resource that run in Windows and Linux.
MaSSHandra uses a real 3D environment to create network diagrams