The best alternatives to ForgetNot are Check, Checklistomania, and Quick Check. If these 3 options don't work for you, we've listed a few more alternatives below.
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Check is an ephemeral to-do list for iOS. It provides: - tasks are removed after a certain duration - you can define the duration for tasks in hours (default is 24 hours). - The "task graveyard": Tasks which are not finished within the duration are killed and can be found in the graveyard. You can easily revive them and try them again later.
Checklist is a free Android app for getting things done with simple to-do lists. Fatless. Fast. ✔ Create many lists ✔ Manage items by simple gestures ✔ Drag and drop to reorder items ✔ Set reminders to your tasks ✔ Import items from instant messages ✔ Switch mode to show/hide checked items ✔ Put a widget with tasks on your home screen