A very small, very simple, yet very secure encryption tool. - Picocrypt/Picocrypt
Encrypt Dropbox, Google Drive, and any other cloud. Cryptomator is free and open source.
AES Crypt is an advanced file encryption utility that integrates with the Windows shell or runs from the Linux command prompt to provide a simple, yet powerful, tool for encrypting files using the Advanced Encryption Standard (AES). A Java library is also available for developers using Java to read and write AES formatted files.
KeePass is a free open source password manager. Passwords can be stored in an encrypted database, which can be unlocked with one master key.
KeePassXC Password Manager
VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
