Redwoodcity

It is a plug-in that displays a notepad on the widget. The data is saved in LocalStorage in the browser, so you can use it easily without login.

WP Notepad

It is a plug-in that displays a notepad on the widget. The data is saved in LocalStorage in the browser, so you can use it easily without login.

Iftekhar Bhuiyan

AdminPad allows WP site admin (only) to write down simple note from WP dashboard using simple widget. Deleting this plugin will also delete data saved by this plugin on your database.
Features: 
* Light weight plugin. 
* Simple user interface.

AdminPad

AdminPad is a simple note taker for site administrator only.

WP Notepad vs AdminPad