SmartCal

SmartCal is an innovative organizer that integrates everything from the big picture to the shopping list, directly into your calendar. It’s amazingly easy to use: Keep a simple to-do list. Gather your notes and ideas into a Project. Keep track of your appointments in the calendar (with day, week or month views). Even create multiple ‘recurring’ lists like grocery shopping or packing for the business trip.

Price: $4.99 – Download
Developer’s Website