Microsoft To-Do - Task management tool
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Gone - An ephemeral to-do list
Sliding Explorer - Sliding Explorer is a free fast and stylish file manager app specially designed for those who want to manage their phone files easily and quickly.
KosmoTime - The to do list with super powers
Cabinet Beta - Cabinet Beta is a fast, stable, and easy-to-use file manager that allows you to easily manage your all files on the phone, SD card, and cloud, etc.