Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
FreedomBox - FreedomBox is a personal server running a free software operating system, with free applications designed to create and preserve personal privacy.
UptimeRobot App - Web, SSL, ports & Cron-jobs monitoring
DockSTARTer - DockSTARTer helps you get started with home server apps running in Docker.
Cronitor - Monitor cron jobs, micro-services, daemons and almost anything else, no setup required. Easier cron troubleshooting and no more silent failures.
SlapOS - SlapOS is a decentralized Cloud Computing technology.