Do you know a good motion detection software?

I need a motion detection program that will send an email with a photo whenever motion is detected from a webcam, I can’t pay pricey costs for email subscriptions or anything like that, so if there is a way to set up an email server or something I can use that would be good. I saw one ispy freeware that supposedly can send emails from your own service but I can’t find any more info, and I wouldn’t know how to set it up.