These webcams were found by Google. Their owners might or might not have intended for them to be public. But they obviously are. Many of them are security cameras in companies or semi-public places. If you hover over the picture you'll see at least the country the camera is in. If you click on it you'll see the live feed, if your browser knows what to do about the Motion JPEG format.
Please note if you're looking for some pr0n, this isn't the link for you. It looks at public and security cameras around the world.