If you can build this, you will have thousands of buyers, starting with me. https://www.serve manager.com
The freelance manager (code for sale on this website, and a darn good one I might add), is as close as it gets. Adding some appealing color options (desparately needed), and the ability to show an image file for each case, as well as a map (based on an address), would be a grand slam! The entire legal field, is a potential client. Seriously, millions of attorney’s, paralegals, process servers, legal messengers, marshals, sheriff’s, police departments, etc.
According to that link it looks like someone already built it.
True. However, theirs is missing a few key elements. Additionally, its not a platform that can be used by all. Lastly, if you knew of a market where there was only one competitor, why would you not be interested in making a better or competing product?