Lender

Your friends are not correct ! 
You lend them your equipment and of course, they forget to give it back.
You have it everywhere and you don't remember who has what?

Lender could help you.

Create your own loan forms (and your own borrowing forms because You are not blameless either).

It's easy to do:
-Enter the borrower's information,
-Fill in the fields about the loaned item, 
-Set a reminder, 
-Enter the location,
-Take a picture... and that's it.

From now on, your friends will have to behave themselves or you will be ruthless, I'm sure.