Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Skyro - A gorgeous voice recording app with embedded images
MuseScore.org - Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore. For Windows, Mac and Linux.
Quick Record - Voice memos audio recorder with iCloud sync
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.
Audio Memos - Audio Memos is a voice recorder for the iPhone and iPad.