On-Screen Ruler - lightweight, free, semi-transparent ruler
Paranoia Text Encryption - Paranoia Text Encryption encrypts text according to a choice of strong algorithms.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
Encrypted Notepad - Encrypted Notepad is a very simple to use application providing state of the art...
Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.
Notebook PEA - Protects your private notes with a password.