cronbot is a wrapper script for cron jobs. Rather than running your job/script directly, you run it through cronbot, and it will allow a little more control to help keep things from getting out of hand. The default behavior is to only allow one instance of your job to run. This can be changed with the --duplicate option. You can also pass in a maximum time of execution for a job or add a random amount time to delay the start of your job. By default, jobs are run with a default "nice" value, which is usually 10.
Ozeki NG SMS Gateway sends and receives SMS, MMS, email, and voice messages via GSM modem connections or directly over the Internet (SMPP, UCP, CIMD2) to/from mobile phones. It is useful for SMS services like SMS notifications, two-way SMS systems, automated SMS services, SMS paging, SMS games, billing systems, email-to-SMS forwarding, premium rated SMS services, etc. It supports various APIs.