For anyone who is interested...

If you would like Free open source software that allows you manage listings on your website, among other things, then you might check into Open Realty.

If you would like to see this program in action I use it on my Arizona Multiple Listing site. You can incorporate this functionality into almost any existing site.

Also, this program has a great support forum in case you run into problems or have questions.

I wish someone would have told me about this program.