Looking for an addon...

Hello, I think this is my first post.

I’m looking for an addon for my sandbox server, and I’m willing to pay for its creation if it doesn’t exist.

I’d like to have an inventory system, sort of like the DarkRP inventory pick-up, but I can pick up props, entities and other things.
Only trouble is, the only addons that do this are either unavailable, or broken.
If anyone can help me find an inventory system that works for sandbox or can make a quick one, please throw me a bone.

I’ll pay real money!

Edit: If this isn’t in the right section, could a mod please move it for me? I’m very new to this site.