Mac: We all need to be reminded of things throughout the day, but setting up a series of alerts and tones isn't always the best. Gestimer is a Mac app that sits in your menubar and lets you quickly create short-term reminders by just dragging down on the icon.
Once you create a reminder, you can add a note to it, then it sits in your menubar until it's time to send you a notification. Since Gestimer uses a drag-and-pull gesture, it's best suited for short term reminders, unless you feel like pulling the icon all the way across your screen. Still, it's one of the quickest and easiest ways to remind yourself to do something on your Mac.
Gestimer ($3.79) [iTunes App Store]