CubicSDR - CubicSDR is a cross-platform Software-Defined Radio application which allows you to navigate the...
EMSO simulator - EMSO simulator is an equation-oriented process simulator with a graphical interface for modeling...
Gqrx - Gqrx is a software defined radio receiver powered by the https://alternativeto.
Altair Activate - Altair Activate is an open & flexible tool for rapidly modeling and simulating products as multi-disciplinary systems in the form of 1D models (expressed as signal-based or physical block diagrams), optionally coupled to 3D models.
GNU Radio - GNU Radio is a free & open-source software development toolkit that provides signal processing blocks to implement software radios.
Minsky - System dynamics program with additional features for economics