OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.

Notezilla - Colorful & powerful sticky notes app for Windows & Phones.

CherryTree - A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.

Microsoft Sticky Notes - A brand new Sticky Notes for Windows has arrived!

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.