Tomboy - Apps/Tomboy - GNOME Wiki!
Stickies - Stickies is a PC utility written to replace Post-It-style notes left stuck to your monitor.
Notezilla - Colorful & powerful sticky notes app for Windows & Phones.
ColorNote - ColorNote is a simple notepad app.
Scrawl - Scrawl is a notes taking and memo app that lets you keep track of the things that are important for you, like daily routine tasks, projects, reminders, calculations, or accountability of someone.
TopXNotes - TopXNotes is a personal notes and information organizing tool that you can use on iOS or Mac OS.