Any good schematic drawing software?

Bump for this.

I was thinking along similar lines it would be good to create interactive schematics. Click on a link and it highlights it with the wire colour and termination points. Click on a switch and it highlights the relay that it's on. Click on a relay and it highlights all the switches in it's stack. Perhaps even be able to change state. That kind of thing.

You're gonna have a real hard time finding anything 'free' that will 'auto-place' components.

You can try DipTrace, there's a free version of that, with a not-too-steep learning curve. But you're in for a long ride, if this is your first shot.

DipTrace is the best I've found, but the free version has a limit on how many traces you can run which may be a problem.

An interactive schematic viewer like astyy describes would be really cool, but I don't know of anything like that existing. Current schematics for games are definitely limited by trying to fit on single sheets of paper causing you to have to page back and forth a ton sometimes.

Try Kicad. It is free, gratis schematic and PCB editor. Unlimited sheets. I think you can set the page size to what you like. It has quite a large component library (what is a bit cumbersome to use) but it is easy to create your own symbols.
I use it for all my schematics and PCB's. Some people hate the user interface, but I had never problems with it. Tip is to learn the keyboard shortcuts. They are essential.

I’ll vote for DipTrace being easy to learn and use, and not terribly pricey. It’s lacking some features for a full production environment but for your purpose it’s prbably the quickest option.

KiCad is certainly another option and some people love it. I applaud them. For me, it requires a degree of self-loathing that I simply do not possess.

Also, check your connections at F2 & F3. The lines are touching but the square boxes indicate that the editor has not connected them.

KiCad is free and highly functional.

Eagle has or used to have a free / educational versions that will let you do a single page schematic but not board layout bigger than a NVRAM module. Eagle is on some stupid pay as you go system now, but perhaps you can find an old trial / educational version on the web somewhere.

Both are tedious to learn, but not too bad. I'd say learn how to make components for each first, but if you just doing schematics, you probably don't have to learn how to make components as long as you can find the schematic symbols you want in the provided library.