QOwnNotes - QOwnNotes is a free plain-text notepad with markdown support for Linux, Mac OS X and Windows, that works together with ownCloud Notes.
Jetico BCTextEncoder - Jetico BCTextEncoder is software that ensures your text-based communications are safe by allowing you to encrypt them.
EncryptPad - EncryptPad is an application for viewing and editing symmetrically encrypted text.
TheLetterEncrypter - TheLetterEncrypter is a small (14KB download) AES-based text-encryption program.
Notepads - Notepads is a modern, simple yet powerful text editor for Windows 10
GizmoMarks - GizmoMarks is software that provides secure block-notes by encrypting them in a way that nobody can understand.