FreeCAD - An open-source parametric 3D modeler
Synthesio - Synthesio is a social intelligence tool or a marketing software that is specially made for the purpose of social media monitoring and social analytics.
SketchUp - 3D for Everyone
Swift Social - All-in-One Social Media Growth and Management Tool
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
LeadsRX - LeadsRX is a marketing attribution software that gives marketers insights into which advertising campaigns result in conversions.