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if you have an Android device, Apple created an Android app for this:

https://play.google.com/store/apps/details?id=com.apple.trac...

Yes. It's called an iPhone.

Can an iPhone detect other people's AirTags? What about an iPad? How do I do that?

I'm not the OP nor am I sure about the specific answer to your question, but an iPhone will alert you if there's an airtag that's following you around which doesn't belong to you. In other words, if someone is tracking you it will alert you. There is also an app for Android that does the same.

So Apple has a tool against stalking caused by their own products. Reports of abuse are rising though. Technically trackers are illegal in Germany, but the law and legislation acts slowly.

As I understand it's just a Bluetooth Low Energy beacon, at least for the coarse-grain positioning.

I don't know of any portable devices that specifically hunt BLE (I understand Cisco CleanAir technology can monitor and report on BLE but that's for fixed wireless installations) but I would imagine a generic 2.4GHz RF detector would work, assuming there's not too much RF pollution nearby... drive out somewhere isolated and have a scan.