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Arcadia Design Systems
http://www.arcadiadesign.com/
Everest Design Automation
http://www.everest-da.com/
Gambit Automated Design
http://www.gambit.com/
Sagantec
http://www.sagantec.com/
Sycon Design
http://www.sycon-design.com/
Xyalis
http://www.xyalis.com/
Developer of a suite of IC layout finishing tools for 32bit and 64bit platforms. Includes product descriptions and screen snapshots.