- Digital Filter Corporation
 - Offers various software to design digital FIR and IIR filters. - DSP Development Corporation
- DADiSP, graphical data analysis software programme for scientists and engineers.
- DSP Solutions
- Developers of PC-DSP and PC-SIM, DOS- and Windows-based software tools for signal processing and simulation.
- DSP Tools, Inc.
- Specialises in the development of digital signal processor hardware and software.
- Innovative Integration, Inc
- Manufacturers of DSP-based data acquisition and control hardware and software.
- Iowegian International Corporation
- ScopeDSP performs time/frequency signal analysis, and ScopeFIR designs finite impulse response filters.
- MYCOMM, Inc.
- Engineering consulting firm specialising in DSP simulators and applications.
 Numerix Ltd
- Supplier of DSP libraries and solutions for modern DSPs and general purpose processors.- Signal Processing Toolbox
- Manufactured by The MathWorks, makers of MATLAB. Signal Processing Toolbox is a collection of industry-standard algorithms for analogue and digital signal processing.
- Signition, Inc.
- Maker of digital signal processing software, SigniScope.
- TA Signal Processings
- Provides software for signal processing and analysis, including design tools for FIR/IIR filters.
- Toolsmiths
- Research and development of software tools for computational science, engineering, and medicine.
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