Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
OneLogin - On-demand SSO, directory integration, user provisioning and more
UptimeRobot - Free Website Uptime Monitoring
TeamPassword - TeamPassword helps you manage and share access to the apps, services, and tools your team needs to keep projects moving.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Teramind - Teramind provides a user-centric security approach for monitoring.