- Freemium • Open Source
- Android Tablet
Cryptomator provides transparent, client-side encryption for your cloud. Protect your documents from unauthorized access. Cryptomator on the desktop is free and open source software, so you can rest assured there are no backdoors.
- Free • Open Source
[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
Currently unmaintained. Last version, TrueCrypt 7.1a, is still available for download and development has continued via the forks VeraCrypt and CipherShed. "The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images."
- Freemium • Proprietary
S.S.E. File Encryptor is a cross-platform encrypter/decrypter of files and folders.