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From a embedded systems designer:
FPGA development - Lattice Diamond runs on Linux - free to download, not open source
KiCAD Schematic capture & PCB layout - free to download, open source
VariCad Mech designer - licenced software
MPLabX PIC microprocessor IDE - free to download
Qt for cross platform apps Windows/Linux/Android/iOS
With Libre office & other tools it's quite possible to run an engineering business from a Linux platform, which I do.