LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
FreeCAD - An open-source parametric 3D modeler
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
SketchUp - 3D for Everyone
n8n.io - Free and open fair-code licensed node based Workflow Automation Tool. Easily automate tasks across different services.