First, Welcome to the Forum!
Yes, there are. Others will be along to tell you what they are. Several recent posts have included those web sites.
The other GREAT resource is http://www.remcoindustries.com/Towing/ You can see if a specific vehicle can be flat towed and what parts are needed. There is no requirement to buy from them, but their site can be very helpful.
You can always come here to ask about a specific vehicle of interest.