WebTimer can be used to continually download a single URL from the internet, most useful in situations where you want to monitor Web-Cams. In fact, it was written expressly with this in mind (apparently there aren't any Mac apps that do this!), but there might be other reasons you would want to use this software.
Version 1.6.1 adds the ability to handle CGI scripts that build content on the fly. Previously, the content would never be downloaded because it's content size was returned as "-1". Now you can specify whether or not you care what the size of the download is.
Mac OS X 10.1 or later