Digital Test  
   Design for manufacturing and test quality management software. Three major products are C-LINK, CITE, and QMAN.
   http://www.usdigitaltest.com/

Soft Test Inc.  
   Semiconductor test program development services for digital and mixed signal devices on all popular ATE test systems.
   http://www.soft-test.com/

Unisoft  
   CAD-to-test conversion tools. Manufacturing framework that automates translation of CAD or Gerber plot information.
   http://www.unisoft-cim.com/

Flynn Systems  
   GenRad, HP, Teradyne: Develops software to generate test programs for electronic devices.
   http://www.flynn.com/

Electronics Workbench  
   Product portfolio consists of software for the design of electrical circuitry to be implemented on printed circuit boards (PCBs) and programmable logic devices (FPGAs/CPLDs) and includes: schematic capture, component database, SPICE simulation, FPGA/CPLD
   http://www.electronicsworkbench.com/

Probe Assist  
   Allows ATE and production test engineers to annotate a picture of a unit under test with arrows and tags and create ppf files that can be executed from test code. Includes list of features, screen snapshots and software available for download.
   http://jhaas0.tripod.com/ProbeAssist/

Intercal LLC.  
   Produces automated calibration tools used in the maintenance of electronic and mechanical test equipment and systems. Includes search facility for available calibration procedures.
   http://www.intercalinc.com/