LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
PTC Windchill - Windchill offers breakthrough Product Lifecycle Management (PLM) capabilities, unleashing more data to more stakeholders throughout your organization through a single source of truth for product data and processes.
FreeCAD - An open-source parametric 3D modeler
Propel - Propel is a customer-centric PLM software built on Salesforce App Cloud platform.
SketchUp - 3D for Everyone
SAP PLM - SAP Product Lifecycle Management (SAP PLM) application provides you with a 360-degree-support for all product-related processes - from the first product idea, through manufacturing to product service.