I find pocket informer for iPhone is great. It allows you to invite someone (who has the same app) to share your calendars. The app is pricey but it has been worth it for me. You can also set alarms for appointments, has task list and allows you to sync with google
calendar.
Alarmed is another iPhone application. I can use it for my med reminder, alarm clock, and a timer as well. There is a free version and and $1.99 version. The app will go as far to nag you till you turn it off.
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