List of CAD companies

Many CAD companies produced CAD software in the 1970's - present. Some of them are listed below. The list is far from complete or representative: 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.

Autodesk
Bentley Systems
CADDS5
Cadkey
CATIA
EDS
Euclid
I-DEAS
Inventor
Intergraph
Matricus
ME
Pro/ENGINEER
QCad free software
Solid Edge
Solid Works
Think3
Unigraphics
VariCAD
Vectorworks

Some CAD software

AutoCAD (by Autodesk)
Caddie
Microstation (by Bentley Systems)

A comprehensive list of electronic design automation (EDA) Companies can be copiled from lists of vendors-exhibitors of DAC (Design Automation Conference) held yearly for more than 30 years. Some are listed below

Avanti (merged into Synopsys)
Cadence Design Systems, Inc
IC-Ed
Mentor Graphics
MyCad
Stabie-Soft
Silvaco
Synopsys
Tanner Research