Whimsical Sticky Notes - Visual project management using sticky notes
iNotepad - Write and organize all your texts and notes on Mac.
Jot - The no-fuss way to take notes
HTML-Notepad - HTML WYSIWYG editor for structured documents
Gone - An ephemeral to-do list
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++