[Johnno]

Are there any inventory programs out there? If not how do y'all keep track of stuff, cars, motors etc?

I stumbled across Recollector, it is as it's name suggests a collection software. When registered, which is cheap, you can start multiple collections such as stamps, slot cars, music, DVD etc. Very easy to use, allows you to include multiple images, I've done 30 photo's as a test without problems, I run mine from a network folder, it has a smartphone app as well that let's you carry your collection with you everywhere, again this operates via a cloud platform without issue.

Links: 
Link 1 - Recollector

Link 2 - Recollector