Cooper & Chyan; Jim Solomon, whose Solomon Design Automation merged with ECAD to become Cadence; Daisy, CADnetix and their offshoot,
Dazix; Racal-Redac; Electronics Workbench; OrCAD; Lavenir; ACCEL; Jim Meadlock and Intergraph; Tangent; Tom Bruggere of Mentor; the list goes on.