List of CAx companies

This is a list of computer-aided technologies (CAx) companies and their software products.
Software using computer-aided technologies (CAx) has been produced since the 1970s for a variety of computer platforms. This software may include applications for computer-aided design (CAD), computer-aided engineering (CAE), computer-aided manufacturing (CAM) and product data management (PDM).
The list is far from complete or representative as the CAD business landscape is very dynamic: almost every month new companies appear, old companies go out of business, companies split and merge. Sometimes some names disappear and reappear again.
Past CAD Brands.
Acquired, orphaned, failed or rebranded.
In-house CAD software.
Developed by companies for their own use. Some are no longer used as the organizations are now using commercial systems.