Cryptee - Cryptee is a safety and privacy focused, encrypted and cross-platform personal data storage service. You can write personal documents, notes, journals, store photos and all sorts of other files.
Notepad by Splend Apps - Notepad by Splend Apps is one of the best mobile apps that enables you to create a to-do list and notes.
SocialVault - Decentralized, encrypted storage and browser for your Facebook data.
Archos File Manager - Archos File Manager is an app that you can use for Archos devices to manage, copy, move, and delete files.
Tresorit - Encrypted cloud storage for your confidential files. Using Tresorit, files are encrypted before being uploaded to the cloud. Start encrypting files for free.
OpenExplorer - OpenExplorer is a file manager app that provides a user-friendly interface and allows you to easily manage your media files, whether it’s on an SD card or internal storage.