Microsoft Sticky Notes - A brand new Sticky Notes for Windows has arrived!
Notezilla - Colorful & powerful sticky notes app for Windows & Phones.
Stickies - Stickies is a PC utility written to replace Post-It-style notes left stuck to your monitor.
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.
NoteFly - NoteFly is a small advance note taking application that allows you to create sticky notes.
Tomboy - Apps/Tomboy - GNOME Wiki!