Cronitor - Monitor cron jobs, micro-services, daemons and almost anything else, no setup required. Easier cron troubleshooting and no more silent failures.
Monitoro - Monitor webpages and get fresh data sent to your webhooks.
UptimeRobot - Free Website Uptime Monitoring
Accordably - Competitor monitoring made easy.
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.
GitHub Diff - Compare changes across GitHub branches, commits, or tags