Cronitor - Monitor cron jobs, micro-services, daemons and almost anything else, no setup required. Easier cron troubleshooting and no more silent failures.
Brandpa - Domain names for startups
UptimeRobot - Free Website Uptime Monitoring
Nuage - Nuage provides domain naming services.
Cronhub - Cronhub helps you to easily monitor all your cron jobs in a beautiful dashboard. It alerts you when your cron job doesn't run on time or it fails.
DomainWatch - Domain Monitoring Made Easy