I assign some tasks to my kids (who also have access to the software). Maybe a few weekly tasks like clean your room, and a daily task like complete your homework.
If they don’t mark it complete before the due date, the software can send an e-mail or SMS text reminder every day until the task is completed.
Maybe even a simple project management app might suffice, if it could be setup with periodic tasks and repeating follow ups.
The important requirements are that the reminders can be recurring, and that SMS/text can be used in addition to e-mail followups.
I’ll take anything. Windows app, mobile app for iOS or Android, etc.