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.

Personal Knowbase - Can't find your critical notes when you need them?

Simplenote - The simplest way to keep notes. Light, clean, and free. Simplenote is now available for iOS, Android, Mac, and the web.

NoteAway - NoteAway is the simplest, most convenient way to take quick notes on OS X.

Laverna - Laverna is a JavaScript note taking application with Markdown editor and encryption support.

Hive - Seamless project management and collaboration for your team.