* Gesellschaft fuer Mikroelektronik (GME)
* Infineon AG
* Microchip
* Freescale.com
* National Semiconductor
* ON Semiconductor
* ST Microelectronics
* Texas Instruments
* Linear Technologies
* Analog Devices
* Further companies
* Cadence
* Linux
* Xcircuit (schematic entry)
* pcb (board layout tool)
* ngspice (Spice simulator)
* SPICE OPUS
* Icarus Verilog
* Waveform viewer (for verilog)
* Euler
(Mathematical calculations and simulations)
* Scilab
(Mathematical calculations and simulations)