Cron Source
In the most basic sense, the service does nothing more than bring crowdsourcing to cron jobs.
The way it works is simple: if your host limits or does not provide access to cron (or if they do but you hate them), sign up and enter the URLs of your cron jobs. Then, add your Cron code (a JavaScript file) to the bottom of each of your sites.
Each time your cron code is loaded, your visitors will unknowingly run a cron job if one is waiting. If run time comes and no one is around, another site's visitors will run your cron job for you.
Cron jobs can be scheduled to run as often as every 5 minutes. Crowdsourcing comes in to play because the cron jobs are initiated by your visitors rather than a web server.
If you are interested in trying it, visit FreeCronJobs.com.
