KiCAD. It's so good these days.
I still code most Python in IDLE. It's fine!
Various flavors of Linux and the many, many applications supporting that. Also OpenWRT. OpenOffice > Google Sheets.
I also grabbed an open-source script that would turn on a fan every time the humidity level rose high enough for a specific type of mold to grow, and move air until it dropped. That ran all day for a few years until the fan broke and I repurposed the other hardware.