are ther any FREE, FLEXIBLE, EASY TO INSTALL & USE, OPENSOURCE design software for engineers which has similar functionalities of softwares like IDEAS-8, NISA, PRO-E, etc on any platform
you can try gEDA , it is a full GPL'd suite of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture, simulation, prototyping, and production.
There is a software called LinuxCAD there, i have seen few professional houses to use this . But i will not prefer it as its not Free ( both in termas of Speech and Beer )
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