http://www.textmagic.com/
TextMagic is a global sms delivery service. You can delivery texts via email, gateways, their own windows app, etc.
http://www.zenoss.com/
A cloud monitoring / type service. Partly open source.
http://newrelic.com/
A system to monitor multiple aspects of a live application in production including the page load times, server load times, mysql response times, javascript render times, and so on. Expensive.
http://www.yottaa.com/
Similar to CloudFlare but more expensive ($30/mth no ssl, $130/mth with ssl) it accelerates web sites through the use of CDN, js/css combining, etc.
http://alertfox.com/
Monitoring with a focus on browser experience. Plans are €10/month for simple, $50/month for 1 browser, $100/month upwards for the full service.
http://www.yireo.com/software/magento-extensions/newrelic
A Magento extension to integrate with NewRelic's monitoring system. I suppose it's a Magento wrapper for the NewRelic PHP library.