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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
FreeCAD - An open-source parametric 3D modeler
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
SketchUp - 3D for Everyone
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.