Simple domain name service (find free names from inserted text/URL)

Hi, I'm looking for someone to help me develop a very simple website for finding free/available domain names. There was a service like it available a few years ago that i used a lot, but it's no longer online and i've yet to find one like it. Basically it should only be a website with two input fields. A text box for entering text, or an input field where you insert an URL. The service will then search through this text or URL and display free and available domain names based on the words in the text, or the URL (words on website). I don't know which domain names to display yet but it will probably not be any more than 20 different ones. URLs like .COM .CO .CC etc I hope you understand what i'm looking for. By the way, i'm a graphic designer with experience in front end design, so it's only the back-end development i need help with. /F