CronChecker.net
I’ve long been frustrated with the highly technical explanations I found online of the cron syntax. (For those unaware, Linux, and Mac OS X, and the like use cron to schedule recurring tasks like reports or maintenance.) I knew roughly what I need to know usually, but I’d often not be entirely clear when specifically my command would run.
Enter CronChecker.net. Type in a cron statement, and it will tell you exactly, in plain english when it will run (or tell you it’s invalid if that’s the case). No fuss, no muss.