KiCad. It’s an electronics design tool on par with commercial options in the industry, which cost a ton of money. Ever since the UI facelift it got a few years ago, it has become my go-to option. They are even working on integrating circuit simulation and finite element analysis, which is just crazy.
Weird that it doesn’t work. The usual way to run scripts on startup is through systemd units though. That has the added benefits of automatically logging all output and letting you control it through commands like systemctl enable <unit name>. It’s a really neat system, and I highly recommend learning it if you see yourself doing this kind of automation more often.
I feel like all C++ does these days is badly and very slowly copy other languages. It wouldn’t be a huge loss.