Quartz Scheduler
6.9#3 in job scheduler softwareFree planFree planAPISelf-hosted
VisitQuartz suits Java application teams that need scheduled or recurring application tasks and control over deployment and storage. It is intended for self-hosted use rather than a hosted scheduling service.
Webcron may suit users who need scheduled script execution alongside checks for server, website, or router availability. Its API and PHP class may be relevant to users connecting to its engine programmatically.