A free program for Android, by Kalle Huttunen.
People who like to stay reminded of the important stuff in their life should consider downloading the Notification Notes mobile app on their smartphones. With it, you can stay on top of your tasks and not forget even the most minor event or detail. The application does so by showing you your notes as native phone notifications, letting you see them right away as soon as you light up the screen.
You may also edit your notes as much as you like; update your to-do or grocery lists in a few taps. Plus, you can hide or bring back notes through a switch.