My Lockbox - My Lockbox is a security software enabling you to password protect any folder on your computer.
Toolsley PGPigeon - Simple but powerful OpenPGP-compatible message encryption webapp.
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.
GPGTools - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
Lockbin - Lockbin is a web application for sending private email messages and files.