Saving props to map?

I’m wondering if there’s an addon that saves props to a map. So lets say you spawn a prop, and then do some magic. Then when you restart the map the prop will still be there. I’m wanting this so that when people join the server they’ll see a few wire textscreens explaining rules or something.
any help?

Making a wire textscreen save and load is much harder than using cam.3d2d to draw it in lua