KiCAD for circuits obviously. Other than then you’re kinda out of luck. AutoCAD is one of those things that never really got a good FOSS alternative since Autodesk is crazy aggressive in the market.

The big thing is that they get governments and big companies to adopt it so you need to use their format to interact with those (which you usually do when drafting).

My company kicked it and switched from Civil to ArcGIS, but that one is also licensed and not really a great pure drafting software (we to utility design, so it’s a bit more suited to our specific style of drafting at least). ArcGIS also has a decent alternative in QGIS that we can switch to, but again it’s not as user friendly as the commercial stuff (which is kinda important when you’re creating workflows for 50+ people).

I have used Blender and FreeCAD as an alternative, but they don’t really come close to the polish that you’d expect from AutoCAD, which has like 50 years of being the industry standard behind it.