I'm wondering if some kind of startup advertising website exists, where people would submit their new startup, side project or app and place a small javascript

I'm wondering if some kind of startup advertising website exists, where people would submit their new startup, side project or app and place a small javascript snippet in their html which would automatically advertise other startups that are part of the advertising website. Similarly, your project would also be advertised on other people's projects who have also signed up. Does something like that exist?