This category comprises all sorts of engineering software that uses Qt.
- Electronic design automation (EDA or ECAD)
- Computer-aided design (CAD) 
- Parametric Solid modeling
- Freeform surface modelling, Class A surfaces.
- Reverse engineering
- Styling and Computer-aided industrial design
- Engineering drawing (Drafting)
- Product and manufacturing information (PMI)
- Reporting and Analytics
- Knowledge Reuse including Knowledge-based engineering
- Sheet metal design
- Assembly modelling and Digital mockup
- Routing for Electrical wiring and Mechanical Piping
 
- Computer-aided engineering (CAE) (Simulation)
- Computer-aided manufacturing (CAM)
- Numerical control (NC) programming
 
- Product lifecycle management (PLM)