Notezilla - Colorful & powerful sticky notes app for Windows & Phones.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
Standard Notes - A safe place for your notes, thoughts, and life's work
HTML-Notepad - HTML WYSIWYG editor for structured documents
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.