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Celery is a task queue that supports scheduling as well, if you're using Python. Backed by several different brokers including Redis.

Shameless plug: we replaced most of our cron jobs with celery and django celery fulldbresult[1], which provides more info and features than the default django-celery integration:

- Save result as json, which is queryable in the database

- Save enough info in the task result to retry the task from the result.

- Retry a task from its result in Django Admin

- Run a periodic task now (e.g., to test your cron task)

[1] https://github.com/resulto-admin/django-celery-fulldbresult

JobScheduler by SOS is free, distributed, supports most *ixes, Windows, and covers most of the things I want in a scheduler.

Rundeck can trigger jobs based on Jenkins events, for example.