[I] am now wondering whether or not there are any programs or utilities available I could upload to my site that could perform the same functions as cron jobs?

Cron relies on a long-running scheduling service (the crond daemon process). To achieve the same effect, you would need to do something equivalent. If your ISP doesn't allow cron jobs, chances are good they they won't look kindly on your leaving a long-running, possibly detached process to achieve the same end.