OneNote is one of the most unique Microsoft software programs available today. It allows users to scribble, type, and paste notes into an application and then share those notes with all connected devices.
There are free OneNote apps for Android, iOS, Windows 8, and Windows Phone. However, users of other Windows PCs and Mac OS computers are generally forced to pay for an Office subscription in order to gain access to the popular note-taking software.
Today, Microsoft announced that it was releasing OneNote for free onto Mac OS and Windows computers in order to expand its user base.
Users with Office 2013 and Office 365 subscriptions are still rewarded with additional capabilities, including Outlook integration and Sharepoint support. However, free users enjoy core OneNote functionality and don’t have to suffer through advertisements.
You can download OneNote for free here: http://www.onenote.com/
OneNote comes with a number of cool and unique features. One of the coolest features is seen below:

Basically, OneNote automatically cleans and crops pictures of receipts and other documents in order to make it easier to keep track of physical documents.
Another unique OneNote advantage is the ability for developers to create their own OneNote extension apps using the recently-released OneNote API. You can check out OneNote apps here.
OneNote’s major competitor is Evernote. Both apps offer similar functionality, although fans of Microsoft and its proprietary Office programs will undoubtedly appreciate OneNote over its competitors.
If you’re looking for an easy way to keep track of documents, images, notes, and other data across all your internet-connected devices, then OneNote is one of your best options.