The rumors are true: Microsoft confirmed today that it is making a version of OneNote available for free on every major desktop and mobile computing platform, including even the Mac. Additionally, the firm has announced some new OneNote tools, OneNote Clipper and Office Lens, as well as new partner services and a new extensibility model that will make it possible for any cloud service to integrate with this amazing note-taking and thought organization solution.
You can download OneNote 2013 for Windows from OneNote.com