Please, please don't advertise your cats as "free". I know it seems like this is the best way to make sure no potential adopters are turned away, but it's well documented that it's always best to ask for at least some fee. If 20$ or 30$ makes the difference between someone wanting to adopt your cats or not, how much could they really want them - would they really make good adopters? If they can't afford a cat that isn't free (like me right now), how can they afford decent cat food or veterinary care for shots or illness.

Also, it's not uncommon to ask for information from the adopters, where they live, cat experience, do they plan on getting them regular vet care/shots and spay/neuter. If you can't do these things, please consider taking them to a shelter. If your local shelter is full, the Western PA Humane Society takes any animal at any time. I volunteer there, they take extremely good care of all the animals. But if so, do it soon, before the summer deluge of surrendered pets starts and all the shelters get really crowded.

Good Luck