Day One - A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Journaly - The customisable journal app
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
Journalistic - A simple, yet powerful micro journaling app
Guitar Pro 7 - Create, play and share your tabs