Pystickynote - Stickynotes for your desktop easily from the command line.
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.
Stickies - Stickies is a PC utility written to replace Post-It-style notes left stuck to your monitor.
Boostnote - Boostnote is an open-source note-taking app.
KingSumo - Grow your audience with viral giveaways that cut marketing costs
Standard Notes - A safe place for your notes, thoughts, and life's work