Encrypted Notepad - Encrypted Notepad is a very simple to use application providing state of the art...
Encrypto - Encrypto lets you encrypt files before sending them to friends or coworkers.
Notebook PEA - Protects your private notes with a password.
File Lock PEA - Password-encryption of files and directories. File PEA encrypts files and folders with authenticated encryption to protect confidentiality and integrity. The program uses memory-hard key derivation functions to prevent custom hardware attacks.
Paranoia Text Encryption - Paranoia Text Encryption encrypts text according to a choice of strong algorithms.
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.