OpenModelica - OpenModelica – A Free Modelica Environment!
CubicSDR - CubicSDR is a cross-platform Software-Defined Radio application which allows you to navigate the...
Xcos - Xcos is a graphical editor to design hybrid dynamical systems models.
Gqrx - Gqrx is a software defined radio receiver powered by the https://alternativeto.
GNU Radio - GNU Radio is a free & open-source software development toolkit that provides signal processing blocks to implement software radios.
SDRangel - SDRangel is an Open Source Qt5 / OpenGL 3.