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EDSA Micro Corporation - http://www.edsa.com
Electrical power systems design software.
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Cyme International - http://www.cyme.com
Offer software for various analyses, design, parameter calculation and distribution.
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Designer's Guide Consulting - http://www.designers-guide.com
Provides verification and simulation services to companies involved in integrated circuit design. Includes information resource about modeling, theory and analysis, as well as a discussion forum.
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Avista Design Systems - http://www.avista.com
Tools to simplify analog and RF design.
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Schematica - http://www.schematica.com
Windows software for design of active filters and linear circuit simulation
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Hbfree - http://hbfree.sourceforge.net/
Free command line RF/microwave harmonic balance circuit simulator, for analog nonlinear circuits simulation with diode and MESFET nonlinear elements.
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AC Microwave GmbH - http://www.linmic.com/
Offers the LINMIC+/N microwave and RF IC design suite; mostly electromagnetics-based.
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