For electrical engineering there is KiCad, which is pretty good overall. Only reason I’m still using proprietary software is because I’d have to recreate my libraries and it will be a huge pita.
For mechanical design there is FreeCad, which is usable for simple geometries, but if you come from a proprietary CAD software you may find it lacking.
please do not bring over reddit memes. Eventually someone will not understand the irony and keep doing it for real. thanks