Automatic Web Based Ad Submitter to Free Classifed Sites

I am looking for a web based software which will allow me to automatically submit ads onto free classified sites like craigslist, backpage, kijijii and any other sites that are available.? I would like the option to add sites if I want to.? I would also lke to have a list of the sites implemented into the software.? I am looking to offer it on a membership site for a small subscription fee.