There is one for wheelchair parking where you take a photo of them (like with your phone, etc) and the site posts them publicly and sends the pic to their local police department.
From what I understand the police response has been picking-up.
There are also "tickets" for you to print-out to put under their wiper.
The worst for me are the dick-heads that park in the loading area next to my van so my ramp can't open and let me into it.
The bag people that stack a ton of carts in there are just as bad also.
I'm to the point now to where I am about to "just not see the car there"... my ramp is 1/4" steel and hydraulic, oops.