Boxcryptor is an easy-to-use encryption software optimized for the cloud. It allows the secure use of cloud storage services without sacrificing comfort.Discontinued
Boxcryptor has been acquired by Dropbox on November 29, 2022, and is no longer accepting new users. https://www.boxcryptor.com/en/blog/post/boxcryptor-and-dropbox-user-info/
With EDS (Encrypted Data Store) you can store your files in the encrypted container to prevent unauthorized access to sensitive information.
Safebox encrypts and syncs files with your Cloud folder. Thanks to generated keys, no more remembering passwords and dealing with strength of passwords. Create separate keys for shared folders and start collaborating. Crypto code is opensourced.