iNotepad - Write and organize all your texts and notes on Mac.
GNUPGK - A GnuPG Frontend GUI made in C#.
HTML-Notepad - HTML WYSIWYG editor for structured documents
TheLetterEncrypter - TheLetterEncrypter is a small (14KB download) AES-based text-encryption program.
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
CTI Text Encryption - CTI Text Encryption is an encryption tool that can encrypt any text from messages and articles to codes, etc.