AWS Storage Gateway - AWS Storage Gateway is a service connecting an on-premises software appliance with cloud-based storage.
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.
Minio - Minio is an open-source minimal cloud storage server.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
VMware vSAN - VMware vSAN is radically simple, enterprise-class software-defined storage powering VMware hyper-converged infrastructure.
Better Uptime - We call you when your website goes down