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Spice based electronic circuit simulation and circuit analysis software. 5Spice is a step up from student oriented simulators but still easy to use.

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Electronics ++

Texas Instruments (TI) is a global analog and digital semiconductor IC design and manufacturing company.

TINA Design Suite is a powerful circuit simulation package for analyzing, designing, and real time testing of analog, digital, VHDL, MCU, SMPS, RF, communication, optoelectronic and mixed electronic circuits and their PCB layouts.

NI leverages commercial technologies, such as industry-standard computers and the Internet, to deliver customer-defined automation, test and measurement hardware and software solutions for engineers and scientists.