Remember is a simple and lightweight app that allows you to create a message and set it as a peristant notification. The point of this is to make a simple reminder that you will always see, whether it is to get something done later on in the day, set a motivational message, or any other thing that you need to be reminded of. Open the app to set the notification, and click the notification to either close it, or to remake the notification.
This app is open source! Find the source code here > https://github.com/MJonesDev/RememberForAndroid