[development] Module for scheduling work?

[Kyle Mathews]

For a module I'm writing, I need a way for end users to be able to schedule
tasks to happen (e.g. send out an email). Is there a helper module or PHP
class out there that I can use to trigger these tasks being completed, both
one time tasks and recurring tasks? Googling has found a few options but
none were that satisfactory so I'm curious what other people have used for
similar situations.

Thanks

--
Kyle Mathews

Blog: kyle.mathews2000.com/blog
Twitter: http://twitter.com/kylemathews
Company: http://eduglu.com
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