My Lockbox - My Lockbox is a security software enabling you to password protect any folder on your computer.
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Sookasa - The only all-in-one enterprise CASB and SaaS security provider to audit activity, protect data end-to-end, and enforce policies on Dropbox, Google Drive, OneDrive, and Slack.
Wise Folder Hider - Wise Folder Hider is a free file/folder hiding tool.
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Hider - The Fort Knox of digital storage: hide & encrypt data (Mac)